1.

Ifx + (1)/(x )=2sinalpha , y +(1)/(y) =2cosbeta,thenx^3y^3 + (1)/( x^3 y^3)is

Answer»

A. `2 cos3( BETA= alpha )`
B. ` 2 cos3( beta+ alpha )`
C. ` 2 SIN3 ( beta- alpha )`
D. `2 sin 3 ( beta+ alpha )`

Answer :C


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