Question

The expression $\Rightarrow$ $\sin 4\theta(2\cos 3\theta - 1) = 0 \Rightarrow \sin 4\theta = 0,\ \cos 3\theta = \frac{1}{2}$ has the positive values for x, given by.

• A. $4\theta = 0$
• B. $\Rightarrow$
• C. For all $4\theta = \pi$
• D. $\Rightarrow$

Answer 1

Answer: (C)

For all $4\theta = \pi$

Answer 2

The expression is

$\Rightarrow$

= $2\cos^{2}\theta - \sqrt{3}\cos\theta - 3 = 0$

Obviously, $\Rightarrow$. Hence it is positive for all value of x.