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Let z=costheta+isintheta. Then the value...

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

A

`1/ sin 2^@`

B

`1/ 3sin 2^@`

C

`1/ 2sin 2^@`

D

`1/ 4sin 2^@`

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