Question

The length of a longest interval in which the function $f(x)=3\sin x-4{\sin }^{3}x$ is increasing, is

• A. $\frac{\pi }{3}$
• B. $\frac{\pi }{2}$
• C. $\frac{3\pi }{2}$
• D. $\pi$

Answer 1

Answer: (A)

Correct answer is (a) $\frac{\pi }{3}$