If f(x) is given by f(x)=(cosx+i sinx)...

If `f(x)` is given by
`f(x)=(cosx+i sinx)(cos3x+isin3x)`.........
.......`[cos(2n-1)x+isin(2n-1)x]`,
then f''(x) is equal to

A

`n^(3)f(x)`

B

`-n^(4)f(x)`

C

`-n^(2)f(x)`

D

`n^(4)f(x)`

Verified by Experts

The correct Answer is:

B

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