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Popular >

2csc^2(x)=3cot^2(x)-1

Solution

2 csc^{2} (x) = 3 cot^{2} (x) - 1

Solution

x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn, x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

Degrees

x = 3 0^{\circ} + 36 0^{\circ} n, x = 15 0^{\circ} + 36 0^{\circ} n, x = 21 0^{\circ} + 36 0^{\circ} n, x = 33 0^{\circ} + 36 0^{\circ} n

Solution steps

2 csc^{2} (x) = 3 cot^{2} (x) - 1

Subtract

3 cot^{2} (x) - 1

from both sides

2 csc^{2} (x) - 3 cot^{2} (x) + 1 = 0

Rewrite using trig identities

1 + 2 csc^{2} (x) - 3 cot^{2} (x)

Use the Pythagorean identity:

1 + cot^{2} (x) = csc^{2} (x)

cot^{2} (x) = csc^{2} (x) - 1

= 1 + 2 csc^{2} (x) - 3 (csc^{2} (x) - 1)

Simplify

1 + 2 csc^{2} (x) - 3 (csc^{2} (x) - 1) : - csc^{2} (x) + 4

1 + 2 csc^{2} (x) - 3 (csc^{2} (x) - 1)

Expand

- 3 (csc^{2} (x) - 1) : - 3 csc^{2} (x) + 3

- 3 (csc^{2} (x) - 1)

Apply the distributive law:

a (b - c) = ab - a c

a = - 3, b = csc^{2} (x), c = 1

= - 3 csc^{2} (x) - (- 3) \cdot 1

Apply minus-plus rules

- (- a) = a

= - 3 csc^{2} (x) + 3 \cdot 1

Multiply the numbers:

3 \cdot 1 = 3

= - 3 csc^{2} (x) + 3

= 1 + 2 csc^{2} (x) - 3 csc^{2} (x) + 3

Simplify

1 + 2 csc^{2} (x) - 3 csc^{2} (x) + 3 : - csc^{2} (x) + 4

1 + 2 csc^{2} (x) - 3 csc^{2} (x) + 3

Add similar elements:

2 csc^{2} (x) - 3 csc^{2} (x) = - csc^{2} (x)

= 1 - csc^{2} (x) + 3

Group like terms

= - csc^{2} (x) + 1 + 3

Add the numbers:

1 + 3 = 4

= - csc^{2} (x) + 4

= - csc^{2} (x) + 4

= - csc^{2} (x) + 4

4 - csc^{2} (x) = 0

Solve by substitution

4 - csc^{2} (x) = 0

Let:

csc (x) = u

4 - u^{2} = 0

4 - u^{2} = 0 : u = 2, u = - 2

4 - u^{2} = 0

Move

4

to the right side

4 - u^{2} = 0

Subtract

4

from both sides

4 - u^{2} - 4 = 0 - 4

Simplify

- u^{2} = - 4

- u^{2} = - 4

Divide both sides by

- 1

- u^{2} = - 4

Divide both sides by

- 1

\frac{- u ^{2}}{- 1} = \frac{- 4}{- 1}

Simplify

u^{2} = 4

u^{2} = 4

For

x^{2} = f (a)

the solutions are

x = f (a), - f (a)

u = 4, u = - 4

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

- 4 = - 2

- 4

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= - 2

u = 2, u = - 2

Substitute back

u = csc (x)

csc (x) = 2, csc (x) = - 2

csc (x) = 2, csc (x) = - 2

csc (x) = 2 : x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn

csc (x) = 2

General solutions for

csc (x) = 2

csc (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn

x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn

csc (x) = - 2 : x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

csc (x) = - 2

General solutions for

csc (x) = - 2

csc (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} csc (x) Undefiend 22 \frac{2 3}{3} 1 \frac{2 3}{3} 22 x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} csc (x) Undefiend - 2 - 2 - \frac{2 3}{3} - 1 - \frac{2 3}{3} - 2 - 2

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

Combine all the solutions

x = \frac{π}{6} + 2 πn, x = \frac{5 π}{6} + 2 πn, x = \frac{7 π}{6} + 2 πn, x = \frac{11 π}{6} + 2 πn

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