If x a cos2 sin and y a sin2 cos then x2 y2 3 is ........

If x = a cos² $\theta$ sin $\theta$ and y = a sin² $\theta$ cos $\theta$ , then (x²+y²)³ is

a²x²/y²

a²x²y²

a²(x²-y²)

None of these

a²x²y²

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