If sinA+sin2A=x, cosA+cos2A=y then cosA=...

If `sinA+sin2A=x, cosA+cos2A=y` then `cosA=`

A

`x^(2)+y^(2)+2`

B

`1/2(x^(2)+y^(2)-2)`

C

`1/2(x^(2)+y^(2)+2)`

D

`2(x^(2)+y^(2)+2)`

Verified by Experts

The correct Answer is:

B

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