1.

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^(@))`

Answer» Correct Answer - D


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