If sin x+sin^2x=1, then cos^6x+cos^(12)x...

If `sin x+sin^2x=1`, then `cos^6x+cos^(12)x+3cos^(10)+3cos^8x` is equal to :

A

1

B

`cos^3xsin^3x`

C

0

D

`infty`

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The correct Answer is:

A

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