Question

The most general value of $\Rightarrow$satisfying the equations $\cos 2\theta = - \frac{1}{2}$and $\Rightarrow$is.

• A. $2\theta = 2n\pi \pm \frac{2\pi}{3} \Rightarrow \theta = n\pi \pm \frac{\pi}{3}$
• B. $\sin 4\theta = 0 \Rightarrow 4\theta = n\pi \Rightarrow \theta = \frac{n\pi}{4}$
• C. $\theta = \frac{n\pi}{4}$
• D. $n\pi \pm \frac{\pi}{3}$

Answer 1

Answer: (A)

$2\theta = 2n\pi \pm \frac{2\pi}{3} \Rightarrow \theta = n\pi \pm \frac{\pi}{3}$

Answer 2

It is obvious.