Is sin(θ)=sin(θ-2pi) ?

The answer to whether sin(θ)=sin(θ-2pi) is True

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

prove sin(θ)=sin(θ-2pi)

prove

sin (θ) = sin (θ - 2 π)

True

Solution steps

sin (θ) = sin (θ - 2 π)

Manipulating right side

sin (θ - 2 π)

Rewrite using trig identities

sin (θ - 2 π)

Use the Angle Difference identity:

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

= sin (θ) cos (2 π) - cos (θ) sin (2 π)

Simplify

sin (θ) cos (2 π) - cos (θ) sin (2 π) : sin (θ)

sin (θ) cos (2 π) - cos (θ) sin (2 π)

sin (θ) cos (2 π) = sin (θ)

sin (θ) cos (2 π)

cos (2 π) = 1

cos (2 π)

cos (2 π) = cos (0)

cos (2 π)

Rewrite

2 π

2 π + 0

= cos (2 π + 0)

Apply the periodicity of

cos

cos (x + 2 π) = cos (x)

cos (2 π + 0) = cos (0)

= cos (0)

= cos (0)

Use the following trivial identity:

cos (0) = 1

cos (0)

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

= 1

= 1

= 1 \cdot sin (θ)

Multiply:

sin (θ) \cdot 1 = sin (θ)

= sin (θ)

cos (θ) sin (2 π) = 0

cos (θ) sin (2 π)

sin (2 π) = 0

sin (2 π)

sin (2 π) = sin (0)

sin (2 π)

Rewrite

2 π

2 π + 0

= sin (2 π + 0)

Apply the periodicity of

sin

sin (x + 2 π) = sin (x)

sin (2 π + 0) = sin (0)

= sin (0)

= sin (0)

Use the following trivial identity:

sin (0) = 0

sin (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}

= 0

= 0

= 0 \cdot cos (θ)

Apply rule

0 \cdot a = 0

= 0

= sin (θ) - 0

sin (θ) - 0 = sin (θ)

= sin (θ)

= sin (θ)

= sin (θ)

We showed that the two sides could take the same form

\Rightarrow True

3 sec^{2} (x) - 2 tan^{2} (x) - 4 = 0

tan (θ) cot (θ) - 1 = 1 - sec (θ) cos (θ)

cos (2 θ) + tan (θ) sin (2 θ) = 1

\frac{cot ( 2 x )}{cos ( 2 x )} = csc (2 x)

(tan (θ) + 1) (tan (θ) - 1) = sec^{2} (θ) - 2