If sin x + sin ^(2) x=1, then the value...

If `sin x + sin ^(2) x=1, ` then the value of `cos ^(12) x+3 cos ^(10) x+3 cos ^(8) x + cos ^(6) x-2` is equal to ............. A) 0 B) 1 C) -1 D) 2

A

1) `sin ^(4) A+ cos ^(4) A`

B

2) `sin ^(2) 2A`

C

3) `2(cos ^(4) A + sin ^(4) A)`

D

4) `2 (cos ^(4) A- sin ^(4) A)`

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The correct Answer is:

C

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