Crey | If f(x) = cos x, cos 2 x, cos 4 x, cos 8 x, cos 16 x, then the value of'(π4) is 1, √2, 1/√2, 0

Question

If f(x) = cos x, cos 2 x, cos 4 x, cos 8 x, cos 16 x, then the value of'(π4) is

Options :

1
√2
1/√2
0

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