JEE MATHEMATICS MCQ: DIFFERENTIATION

1 Easy

1 of 1

Analyzing +4 | -1

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

then the value of

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

View answer and explanation

Correct option: B

\sqrt 2

Option B (

\sqrt 2

) is correct because after simplifying the function using trigonometric identities and then differentiating, the value of f'(

\frac{\pi}{4}

) is

\sqrt 2

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