41. If sin x + sin^ 2 x = 1, then the v...

41. If ` sin x + sin^ 2 x = 1`, then the value of expression `cos^12x+3cos^10x+3cos^8x+cos^6x-1` is equal to

A

0

B

1

C

`-1`

D

2

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The correct Answer is:

A

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