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Select and write the correct answer from the given alternatives in each of the following:`cos^6theta+sin^6theta`=………..

A

`1-3cos^2thetasin^2theta`

B

`1+3cos^2thetasin^2theta`

C

`1-cos^2thetasin^2theta`

D

`1+cos^2thetasin^2theta`

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