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tan(θ+10)=cot(2θ-10)

Solution

tan (θ + 1 0^{\circ}) = cot (2 θ - 10)

Solution

θ = 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}, θ = 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

Radians

θ = \frac{4 π}{27} + \frac{10}{3} + \frac{2 π}{3} n, θ = \frac{13 π}{27} + \frac{10}{3} + \frac{2 π}{3} n

Solution steps

tan (θ + 1 0^{\circ}) = cot (2 θ - 10)

Subtract

cot (2 θ - 10)

from both sides

tan (θ + 1 0^{\circ}) - cot (2 θ - 10) = 0

Express with sin, cos

- cot (- 10 + 2 θ) + tan (1 0^{\circ} + θ)

Use the basic trigonometric identity:

cot (x) = \frac{cos ( x )}{sin ( x )}

= - \frac{cos ( - 10 + 2 θ )}{sin ( - 10 + 2 θ )} + tan (1 0^{\circ} + θ)

Use the basic trigonometric identity:

tan (x) = \frac{sin ( x )}{cos ( x )}

= - \frac{cos ( - 10 + 2 θ )}{sin ( - 10 + 2 θ )} + \frac{sin ( 1 0 ^{\circ} + θ )}{cos ( 1 0 ^{\circ} + θ )}

Simplify

- \frac{cos ( - 10 + 2 θ )}{sin ( - 10 + 2 θ )} + \frac{sin ( 1 0 ^{\circ} + θ )}{cos ( 1 0 ^{\circ} + θ )} : \frac{- cos ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} ) + sin ( \frac{18 0 ^{\circ} + 18 θ}{18} ) sin ( 2 θ - 10 )}{sin ( 2 θ - 10 ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}

- \frac{cos ( - 10 + 2 θ )}{sin ( - 10 + 2 θ )} + \frac{sin ( 1 0 ^{\circ} + θ )}{cos ( 1 0 ^{\circ} + θ )}

\frac{sin ( 1 0 ^{\circ} + θ )}{cos ( 1 0 ^{\circ} + θ )} = \frac{sin ( \frac{18 0 ^{\circ} + 18 θ}{18} )}{cos ( \frac{18 0 ^{\circ} + 18 θ}{18} )}

\frac{sin ( 1 0 ^{\circ} + θ )}{cos ( 1 0 ^{\circ} + θ )}

Join

1 0^{\circ} + θ : \frac{18 0 ^{\circ} + 18 θ}{18}

1 0^{\circ} + θ

Convert element to fraction:

θ = \frac{θ 18}{18}

= 1 0^{\circ} + \frac{θ \cdot 18}{18}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{18 0 ^{\circ} + θ \cdot 18}{18}

= \frac{sin ( 1 0 ^{\circ} + θ )}{cos ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )}

Join

1 0^{\circ} + θ : \frac{18 0 ^{\circ} + 18 θ}{18}

1 0^{\circ} + θ

Convert element to fraction:

θ = \frac{θ 18}{18}

= 1 0^{\circ} + \frac{θ \cdot 18}{18}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{18 0 ^{\circ} + θ \cdot 18}{18}

= \frac{sin ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )}{cos ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )}

= - \frac{cos ( 2 θ - 10 )}{sin ( 2 θ - 10 )} + \frac{sin ( \frac{18 θ + 18 0 ^{\circ}}{18} )}{cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}

Least Common Multiplier of

sin (- 10 + 2 θ), cos (\frac{18 0 ^{\circ} + θ 18}{18}) : sin (2 θ - 10) cos (\frac{18 θ + 18 0 ^{\circ}}{18})

sin (- 10 + 2 θ), cos (\frac{18 0 ^{\circ} + θ \cdot 18}{18})

Lowest Common Multiplier (LCM)

Compute an expression comprised of factors that appear either in

sin (- 10 + 2 θ)

cos (\frac{18 0 ^{\circ} + θ 18}{18})

= sin (2 θ - 10) cos (\frac{18 θ + 18 0 ^{\circ}}{18})

Adjust Fractions based on the LCM

Multiply each numerator by the same amount needed to multiply its

corresponding denominator to turn it into the LCM

sin (2 θ - 10) cos (\frac{18 θ + 18 0 ^{\circ}}{18})

For

\frac{cos ( - 10 + 2 θ )}{sin ( - 10 + 2 θ )} :

multiply the denominator and numerator by

cos (\frac{18 θ + 18 0 ^{\circ}}{18})

\frac{cos ( - 10 + 2 θ )}{sin ( - 10 + 2 θ )} = \frac{cos ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}{sin ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}

For

\frac{sin ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )}{cos ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )} :

multiply the denominator and numerator by

sin (2 θ - 10)

\frac{sin ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )}{cos ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} )} = \frac{sin ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} ) sin ( 2 θ - 10 )}{cos ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} ) sin ( 2 θ - 10 )}

= - \frac{cos ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}{sin ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )} + \frac{sin ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} ) sin ( 2 θ - 10 )}{cos ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} ) sin ( 2 θ - 10 )}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{- cos ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} ) + sin ( \frac{18 0 ^{\circ} + θ \cdot 18}{18} ) sin ( 2 θ - 10 )}{sin ( 2 θ - 10 ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}

= \frac{- cos ( - 10 + 2 θ ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} ) + sin ( \frac{18 0 ^{\circ} + 18 θ}{18} ) sin ( 2 θ - 10 )}{sin ( 2 θ - 10 ) cos ( \frac{18 θ + 18 0 ^{\circ}}{18} )}

\frac{- cos ( - 10 + 2 θ ) cos ( \frac{18 0 ^{\circ} + 18 θ}{18} ) + sin ( - 10 + 2 θ ) sin ( \frac{18 0 ^{\circ} + 18 θ}{18} )}{cos ( \frac{18 0 ^{\circ} + 18 θ}{18} ) sin ( - 10 + 2 θ )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

- cos (- 10 + 2 θ) cos (\frac{18 0 ^{\circ} + 18 θ}{18}) + sin (- 10 + 2 θ) sin (\frac{18 0 ^{\circ} + 18 θ}{18}) = 0

Rewrite using trig identities

- cos (- 10 + 2 θ) cos (\frac{18 0 ^{\circ} + 18 θ}{18}) + sin (- 10 + 2 θ) sin (\frac{18 0 ^{\circ} + 18 θ}{18})

Use the Angle Sum identity:

cos (s) cos (t) - sin (s) sin (t) = cos (s + t)

- cos (s) cos (t) + sin (s) sin (t) = - cos (s + t)

= - cos (- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18})

- cos (- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18}) = 0

Divide both sides by

- 1

- cos (- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18}) = 0

Divide both sides by

- 1

\frac{- cos ( - 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} )}{- 1} = \frac{0}{- 1}

Simplify

cos (- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18}) = 0

cos (- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18}) = 0

General solutions for

cos (- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18}) = 0

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n, - 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n, - 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n

Solve

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n : θ = 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n

Move

10

to the right side

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n

Add

10

to both sides

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} + 10 = 9 0^{\circ} + 36 0^{\circ} n + 10

Simplify

2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n + 10

2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n + 10

Multiply both sides by

18

2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 9 0^{\circ} + 36 0^{\circ} n + 10

Multiply both sides by

18

2 θ \cdot 18 + \frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18 = 9 0^{\circ} \cdot 18 + 36 0^{\circ} n \cdot 18 + 10 \cdot 18

Simplify

2 θ \cdot 18 + \frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18 = 9 0^{\circ} \cdot 18 + 36 0^{\circ} n \cdot 18 + 10 \cdot 18

Simplify

2 θ \cdot 18 : 36 θ

2 θ \cdot 18

Multiply the numbers:

2 \cdot 18 = 36

= 36 θ

Simplify

\frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18 : 18 0^{\circ} + 18 θ

\frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( 18 0 ^{\circ} + 18 θ ) \cdot 18}{18}

Cancel the common factor:

18

= 18 0^{\circ} + 18 θ

Simplify

9 0^{\circ} \cdot 18 : 162 0^{\circ}

9 0^{\circ} \cdot 18

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= 162 0^{\circ}

Divide the numbers:

\frac{18}{2} = 9

= 162 0^{\circ}

Simplify

36 0^{\circ} n \cdot 18 : 648 0^{\circ} n

36 0^{\circ} n \cdot 18

Multiply the numbers:

2 \cdot 18 = 36

= 648 0^{\circ} n

Simplify

10 \cdot 18 : 180

10 \cdot 18

Multiply the numbers:

10 \cdot 18 = 180

= 180

36 θ + 18 0^{\circ} + 18 θ = 162 0^{\circ} + 648 0^{\circ} n + 180

54 θ + 18 0^{\circ} = 162 0^{\circ} + 648 0^{\circ} n + 180

54 θ + 18 0^{\circ} = 162 0^{\circ} + 648 0^{\circ} n + 180

54 θ + 18 0^{\circ} = 162 0^{\circ} + 648 0^{\circ} n + 180

Move

18 0^{\circ}

to the right side

54 θ + 18 0^{\circ} = 162 0^{\circ} + 648 0^{\circ} n + 180

Subtract

18 0^{\circ}

from both sides

54 θ + 18 0^{\circ} - 18 0^{\circ} = 162 0^{\circ} + 648 0^{\circ} n + 180 - 18 0^{\circ}

Simplify

54 θ = 144 0^{\circ} + 648 0^{\circ} n + 180

54 θ = 144 0^{\circ} + 648 0^{\circ} n + 180

Divide both sides by

54

54 θ = 144 0^{\circ} + 648 0^{\circ} n + 180

Divide both sides by

54

\frac{54 θ}{54} = 26.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54}

Simplify

\frac{54 θ}{54} = 26.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54}

Simplify

\frac{54 θ}{54} : θ

\frac{54 θ}{54}

Divide the numbers:

\frac{54}{54} = 1

= θ

Simplify

26.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54} : 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

26.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54}

Group like terms

= 26.66666 \dots^{\circ} + \frac{180}{54} + \frac{648 0 ^{\circ} n}{54}

Cancel

26.66666 \dots^{\circ} : 26.66666 \dots^{\circ}

26.66666 \dots^{\circ}

Cancel the common factor:

2

= 26.66666 \dots^{\circ}

= 26.66666 \dots^{\circ} + \frac{180}{54} + \frac{648 0 ^{\circ} n}{54}

Cancel

\frac{180}{54} : \frac{10}{3}

\frac{180}{54}

Cancel the common factor:

18

= \frac{10}{3}

= 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{648 0 ^{\circ} n}{54}

Cancel

\frac{648 0 ^{\circ} n}{54} : \frac{36 0 ^{\circ} n}{3}

\frac{648 0 ^{\circ} n}{54}

Cancel the common factor:

18

= \frac{36 0 ^{\circ} n}{3}

= 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

Solve

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n : θ = 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n

Move

10

to the right side

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n

Add

10

to both sides

- 10 + 2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} + 10 = 27 0^{\circ} + 36 0^{\circ} n + 10

Simplify

2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n + 10

2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n + 10

Multiply both sides by

18

2 θ + \frac{18 0 ^{\circ} + 18 θ}{18} = 27 0^{\circ} + 36 0^{\circ} n + 10

Multiply both sides by

18

2 θ \cdot 18 + \frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18 = 27 0^{\circ} \cdot 18 + 36 0^{\circ} n \cdot 18 + 10 \cdot 18

Simplify

2 θ \cdot 18 + \frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18 = 27 0^{\circ} \cdot 18 + 36 0^{\circ} n \cdot 18 + 10 \cdot 18

Simplify

2 θ \cdot 18 : 36 θ

2 θ \cdot 18

Multiply the numbers:

2 \cdot 18 = 36

= 36 θ

Simplify

\frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18 : 18 0^{\circ} + 18 θ

\frac{18 0 ^{\circ} + 18 θ}{18} \cdot 18

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{( 18 0 ^{\circ} + 18 θ ) \cdot 18}{18}

Cancel the common factor:

18

= 18 0^{\circ} + 18 θ

Simplify

27 0^{\circ} \cdot 18 : 486 0^{\circ}

27 0^{\circ} \cdot 18

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= 486 0^{\circ}

Multiply the numbers:

3 \cdot 18 = 54

= 486 0^{\circ}

Divide the numbers:

\frac{54}{2} = 27

= 486 0^{\circ}

Simplify

36 0^{\circ} n \cdot 18 : 648 0^{\circ} n

36 0^{\circ} n \cdot 18

Multiply the numbers:

2 \cdot 18 = 36

= 648 0^{\circ} n

Simplify

10 \cdot 18 : 180

10 \cdot 18

Multiply the numbers:

10 \cdot 18 = 180

= 180

36 θ + 18 0^{\circ} + 18 θ = 486 0^{\circ} + 648 0^{\circ} n + 180

54 θ + 18 0^{\circ} = 486 0^{\circ} + 648 0^{\circ} n + 180

54 θ + 18 0^{\circ} = 486 0^{\circ} + 648 0^{\circ} n + 180

54 θ + 18 0^{\circ} = 486 0^{\circ} + 648 0^{\circ} n + 180

Move

18 0^{\circ}

to the right side

54 θ + 18 0^{\circ} = 486 0^{\circ} + 648 0^{\circ} n + 180

Subtract

18 0^{\circ}

from both sides

54 θ + 18 0^{\circ} - 18 0^{\circ} = 486 0^{\circ} + 648 0^{\circ} n + 180 - 18 0^{\circ}

Simplify

54 θ = 468 0^{\circ} + 648 0^{\circ} n + 180

54 θ = 468 0^{\circ} + 648 0^{\circ} n + 180

Divide both sides by

54

54 θ = 468 0^{\circ} + 648 0^{\circ} n + 180

Divide both sides by

54

\frac{54 θ}{54} = 86.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54}

Simplify

\frac{54 θ}{54} = 86.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54}

Simplify

\frac{54 θ}{54} : θ

\frac{54 θ}{54}

Divide the numbers:

\frac{54}{54} = 1

= θ

Simplify

86.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54} : 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

86.66666 \dots^{\circ} + \frac{648 0 ^{\circ} n}{54} + \frac{180}{54}

Group like terms

= 86.66666 \dots^{\circ} + \frac{180}{54} + \frac{648 0 ^{\circ} n}{54}

Cancel

86.66666 \dots^{\circ} : 86.66666 \dots^{\circ}

86.66666 \dots^{\circ}

Cancel the common factor:

2

= 86.66666 \dots^{\circ}

= 86.66666 \dots^{\circ} + \frac{180}{54} + \frac{648 0 ^{\circ} n}{54}

Cancel

\frac{180}{54} : \frac{10}{3}

\frac{180}{54}

Cancel the common factor:

18

= \frac{10}{3}

= 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{648 0 ^{\circ} n}{54}

Cancel

\frac{648 0 ^{\circ} n}{54} : \frac{36 0 ^{\circ} n}{3}

\frac{648 0 ^{\circ} n}{54}

Cancel the common factor:

18

= \frac{36 0 ^{\circ} n}{3}

= 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

θ = 26.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}, θ = 86.66666 \dots^{\circ} + \frac{10}{3} + \frac{36 0 ^{\circ} n}{3}

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