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JEE MATHEMATICS MCQ: DIFFERENTIATION

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Analyzing +4 | -1

If

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

, then

f'\left( {\frac{\pi }{4}} \right)

is

View answer and explanation

Correct option: C

0

The correct answer is C (0) because

f(\frac{\pi}{4}) = 0

, which makes

f'(\frac{\pi}{4}) = 0

.

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