Is sin(3a)=3sin(a)-sin(a) ?

The answer to whether sin(3a)=3sin(a)-sin(a) is False

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

prove sin(3a)=3sin(a)-sin(a)

prove

sin (3 a) = 3 sin (a) - sin (a)

False

Solution steps

sin (3 a) = 3 sin (a) - sin (a)

Show that the two sides are not equal

For

sin (3 a) = 3 sin (a) - sin (a)

plug in

a = 1

sin (3 \cdot 1) = 0.14112 \dots

sin (3 \cdot 1)

Refine to a decimal form

= 0.14112 \dots

3 sin (1) - sin (1) = 1.68294 \dots

3 sin (1) - sin (1)

Refine to a decimal form

= 1.68294 \dots

The two sides are not equal

\Rightarrow False

\frac{cot ( x )}{tan ( x )} = \frac{1}{tan ^{2} ( x )}

2 - sec^{2} (θ) = 1 - tan^{2} (θ)

\frac{tan ( θ ) + sec ^{2} ( θ ) - sec ( θ )}{sec ( θ )} = tan^{2} (θ) + sin (θ)

sin (\frac{9 π}{4}) = sin (\frac{3}{4} π + 2 π)

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

Is sin(3a)=3sin(a)-sin(a) ?
The answer to whether sin(3a)=3sin(a)-sin(a) is False