If x sin ^3 alpha + y cos^3 alpha ...

If ` x sin ^3 alpha + y cos^3 alpha = sin alpha cos alpha ` and ` x sin alpha - y cos alpha =0 , ` then ` x^2 +y^2 ` is

A

0

B

1

C

`sqrt(2) `

D

`2`

Verified by Experts

The correct Answer is:

B

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