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if sin^-1 (x) + sin^-1 (y) = 1 prove that 2(x^2 + y^2- x^2 y^2)=1 + x^4 + y^4

 if sin^-1 (x) + sin^-1 (y) = 1  prove that 2(x^2 + y^2- x^2 y^2)=1 + x^4 + y^4 

Grade:12

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