Question

The general value of $\theta = 2n\pi - \frac{\pi}{2}$ satisfying the equation

$\theta$, is.

• A. $\theta = \frac{\pi}{10}$
• B. $\sin\theta = \frac{\sqrt{5} - 1}{4}$
• C. $4\sin^{4}x = 1 - \cos^{4}x = (1 - \cos^{2}x)(1 + \cos^{2}x)$
• D. $\Rightarrow$

Answer 1

Answer: (B)

$\sin\theta = \frac{\sqrt{5} - 1}{4}$

Answer 2

$\therefore(S + 3)(4S - 3) = 0$ $S = \frac{3}{4}$

$\Rightarrow$ $\sin 2\theta = \frac{3}{4} = \sin\alpha$ $\therefore$ $2\theta = n\pi + ( - 1)^{n}\alpha$.