What is the general solution for 2sin(x)cos(x)=sin^2(x) ?

The general solution for 2sin(x)cos(x)=sin^2(x) is x=2pin,x=pi+2pin,x=1.10714…+pin

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Popular >

2sin(x)cos(x)=sin^2(x)

Solution

2 sin (x) cos (x) = sin^{2} (x)

Solution

x = 2 πn, x = π + 2 πn, x = 1.10714 \dots + πn

Degrees

x = 0^{\circ} + 36 0^{\circ} n, x = 18 0^{\circ} + 36 0^{\circ} n, x = 63.43494 \dots^{\circ} + 18 0^{\circ} n

Solution steps

2 sin (x) cos (x) = sin^{2} (x)

Subtract

sin^{2} (x)

from both sides

2 sin (x) cos (x) - sin^{2} (x) = 0

Factor

2 sin (x) cos (x) - sin^{2} (x) : sin (x) (2 cos (x) - sin (x))

2 sin (x) cos (x) - sin^{2} (x)

Apply exponent rule:

a^{b + c} = a^{b} a^{c}

sin^{2} (x) = sin (x) sin (x)

= 2 sin (x) cos (x) - sin (x) sin (x)

Factor out common term

sin (x)

= sin (x) (2 cos (x) - sin (x))

sin (x) (2 cos (x) - sin (x)) = 0

Solving each part separately

sin (x) = 0 or 2 cos (x) - sin (x) = 0

sin (x) = 0 : x = 2 πn, x = π + 2 πn

sin (x) = 0

General solutions for

sin (x) = 0

sin (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} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 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} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

Solve

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

2 cos (x) - sin (x) = 0 : x = arctan (2) + πn

2 cos (x) - sin (x) = 0

Rewrite using trig identities

2 cos (x) - sin (x) = 0

Divide both sides by

cos (x), cos (x) \neq = 0

\frac{2 cos ( x ) - sin ( x )}{cos ( x )} = \frac{0}{cos ( x )}

Simplify

2 - \frac{sin ( x )}{cos ( x )} = 0

Use the basic trigonometric identity:

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

2 - tan (x) = 0

2 - tan (x) = 0

Move

2

to the right side

2 - tan (x) = 0

Subtract

2

from both sides

2 - tan (x) - 2 = 0 - 2

Simplify

- tan (x) = - 2

- tan (x) = - 2

Divide both sides by

- 1

- tan (x) = - 2

Divide both sides by

- 1

\frac{- tan ( x )}{- 1} = \frac{- 2}{- 1}

Simplify

tan (x) = 2

tan (x) = 2

Apply trig inverse properties

tan (x) = 2

General solutions for

tan (x) = 2

tan (x) = a \Rightarrow x = arctan (a) + πn

x = arctan (2) + πn

x = arctan (2) + πn

Combine all the solutions

x = 2 πn, x = π + 2 πn, x = arctan (2) + πn

Show solutions in decimal form

x = 2 πn, x = π + 2 πn, x = 1.10714 \dots + πn

Popular Examples

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sin (θ) - 0.1 cos (θ) = \frac{8.87}{9.8}

2sin(x)=(sin(x))/(cos(x))

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

6sin^2(x)=5+cos(x),180<= x<= 540

6 sin^{2} (x) = 5 + cos (x), 18 0^{\circ} \leq x \leq 54 0^{\circ}

(cos(x))/2 =(sqrt(3))/2

\frac{cos ( x )}{2} = \frac{3}{2}

2sin(x)cos(2x)-cos(2x)=0

2 sin (x) cos (2 x) - cos (2 x) = 0

Frequently Asked Questions (FAQ)

What is the general solution for 2sin(x)cos(x)=sin^2(x) ?
The general solution for 2sin(x)cos(x)=sin^2(x) is x=2pin,x=pi+2pin,x=1.10714…+pin