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If [frac{1+costheta+isintheta}{i+sinthet...

If `[frac{1+costheta+isintheta}{i+sintheta+icostheta}]^4 = cos ntheta+isin ntheta` , then n is equal to

A

A)1

B

B. 2

C

C. 3

D

D. 4

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