frac{(cos2theta-isin2theta)^4(cos4theta+...

`frac{(cos2theta-isin2theta)^4(cos4theta+isin4theta)^-5}{(cos3theta+isin3theta)^-2(cos3theta-isin3theta)^-9} = `

A

`cos49theta-isin49theta`

B

`cos23theta-isin23theta`

C

`cos49theta+isin49theta`

D

cos21theta+isin21theta`

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