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If $\sin^{- 1} x + \sin^{- 1} y = \frac{π}{2}$ , then $\frac{1 + x^{4} + y^{4}}{x^{2} - x^{2} y^{2} + y^{2}}$ is equal to

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sin−1x+sin−1y=π2⇒sin−1x=π2−sin−1y=cos-1y⇒sin−1x=sin−11−y2⇒x=1-y2⇒x2+y2=1∴1+x4+y4x2−x2y2+y2=1+(x2+y2)2−2x2y21−x2y2 =1+1−2x2y21−x2y2 =2

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If sin−1x+sin−1y=π2, then 1+x4+y4x2−x2y2+y2is equal to

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If $\sin^{- 1} x + \sin^{- 1} y = \frac{π}{2}$ , then $\frac{1 + x^{4} + y^{4}}{x^{2} - x^{2} y^{2} + y^{2}}$ is equal to