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3(sintheta-costheta)^4+6(sintheta+costhe...

`3(sintheta-costheta)^4+6(sintheta+costheta)^2+4(sin^6theta+cos^6theta)` is equal to

A

`13-4cos^(6)theta`

B

`13-4cos^(4)theta+2sin^(2)cos^(2)theta`

C

`13-4cos^(2)theta+6cos^(4)theta`

D

`13-4cos^(2)theta+6sin^(2)thetacos^(2)theta`

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