engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Mathematics Differential Calculus Differentiation of Implicit Functions

If f(x) = cos x . cos 2x . cos 4x . cos 8x . cos 16x . cos 32x, then f’(π/4) is

1
√2
2
1/√2 
3
2
4
1/2
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