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The function f(x)=(cosx+isinx)(cos3x+isi...

The function `f(x)=(cosx+isinx)(cos3x+isin3x)...{cos(2n-1)x+isin(2n-1)x}`, then f'(x) is equal to

A

`n^2f(x)`

B

`-n^4f(x)`

C

`-n^2f(x)`

D

`n^4f(x)`

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The correct Answer is:
B
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