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मान लीजिए `z=costheta+i sintheta` है तब `sum_(m=1)^(15) (z^(2m-1))` का मान `theta=2^(@)` पर होगा -

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मान लीजिए `z=costheta+i sintheta` है तब `sum_(m=1)^(15) (z^(2m-1))` का मान `theta=2^(@)` पर होगा -
A. `(1)/(sin2^(@))`
B. `(1)/(3sin2^(@))`
C. `(1)/(2sin2^(@))`
D. `(1)/(4sin2^(@))`
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Correct Answer - D
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