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If (sinalpha+icosalpha)^4(cos2alpha-isin...

If `(sinalpha+icosalpha)^4(cos2alpha-isin2alpha)^(-2)=costheta+isintheta," then "theta=`

A

0

B

`4alpha`

C

`6alpha`

D

`5alpha`

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The correct Answer is:
A
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