If cos2x+2cosx=1t h e n ,(2-cos^2x)s in^...

If `cos2x+2cosx=1t h e n ,(2-cos^2x)s in^2x` is equal to 1 (b) -1 (c) `-sqrt(5)` (d) `sqrt(5)`

A

1

B

`-1`

C

`-sqrt(5)`

D

`sqrt(5)`

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A

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