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cos^6 theta+sin^6 theta=...

`cos^6 theta+sin^6 theta=`

A

`1 + sin^3 theta cos^3 theta`

B

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

C

`1 - 3sin^3 theta cos^3 theta`

D

`1 + 3 sin^3 theta cos^3 theta`

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