If x=a cos theta + b sin theta and y=a ...

If `x=a cos theta + b sin theta and y=a sin theta - b cos theta.` then` a ^(2) +b^(2) ` is equal to

A

`x ^(2) -y^(2)`

B

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

C

`(x+y)^(2)`

D

`(x-y)^(2)`

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The correct Answer is:

B

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