Let z=cos theta+isintheta. Then the valu...

Let `z=cos theta+isintheta`. Then the value of `sum_(m-1)^(15)Im(z^(2m)-1)` at `theta=2^(@)` is

A

`1/(sin2^(@))`

B

`1/(3sin2^(@))`

C

`1/(2sin2^(@))`

D

`1/(4sin2^(@))`

Verified by Experts

The correct Answer is:

D

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