Let z=costheta+i sintheta. Then, the val...

Let `z=costheta`+i `sintheta`. Then, the value of `sum_(m=1)^15Imz^(2m-1)` at `theta = 2^@` is

A

1) `frac{1}{sin2^@}`

B

2) `frac{1}{3sin2^@}`

C

3) `frac{1}{2sin2^@}`

D

4) `frac{1}[4sin2^@}`

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