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  4. The length of a longest interval in which the function f(x)=3 sin x-4 sin 3 x is increasing, is

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

Application of Derivatives

Solution:

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