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If sin^(-1)x+sin^(-1)y=pi/2,t h e n(1+x^...

If `sin^(-1)x+sin^(-1)y=pi/2,t h e n(1+x^4+y^4)/(x^2-x^2y^2+y^2)` is equal to 1 (b) 2 (c) `1/2` (d) none of these

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