1.

If x + (1)/(x) = 2 sin alpha and y + (1)/(y) = 2 cos beta, then x^(3)y^(3) + (1)/(x^(3)y^(3)) =

Answer»

`2 COS 3 (BETA - alpha)`
`2 cos 3 (beta + alpha)`
`2 SIN 3 (beta - alpha)`
`2 sin 3 (beta + alpha)`

ANSWER :C


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