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(sintheta+icostheta)^n is equal to...

`(sintheta+icostheta)^n` is equal to

A

1) `cosntheta +isinntheta`

B

2) `sinntheta+icosntheta`

C

3) `cosn(frac{pi}{2}-theta) +isinn(frac{pi}{2}-theta)`

D

4) `cosn(frac{pi}{2}-theta)-isinn(frac{pi}{2}-theta)`

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