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The value of (sintheta+i cos theta)^n is...

The value of `(sintheta+i cos theta)^n` is (A) `sin n theta+i cos ntheta` (B) `cos ntheta-i sin n theta` (C) `cos ((npi)/2- ntheta)+is sin ((npi)/2- ntheta)` (D) none of these

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