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If x sin^(3) theta + y cos^(3) theta = s...

If `x sin^(3) theta + y cos^(3) theta = sin theta cos theta` and `x sin theta = y cos theta`, then the value of `x^(2) + y^(2)` is :

A

1

B

`sqrt(2)`

C

`1/sqrt(2)`

D

`1/2`

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LUCENT PUBLICATION-ELEMENTARY TRIGONOMETRIC IDENTITIES -EXERCISE 11B
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