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

If `sin x + sin^(2) x= 1` , then the value of `cos^(8) x - cos ^(4) x + 2cos^(2)x -1 ` is equal to :

A

0

B

1

C

2

D

`sin^(2)x`

Text Solution

Verified by Experts

The correct Answer is:
A
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