JEE MATHEMATICS MCQ: DIFFERENTIATION

1 Easy

1 of 1

Analyzing +4 | -1

f(x)=\cos x \cos 2 x \cos 4 x \cos 8 x \cos 16 x

, then

f^{\prime}\left(\frac{\pi}{4}\right)

View answer and explanation

Correct option: A

\sqrt{2}

Option D (All the above) is correct because

f'(2) = f'(3) = 0

and

f'(\frac{1}{2}) = \frac{16}{5}

, satisfying all the given conditions.

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