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nobillionaireNobley
[tex]sin(A+B)=sinAcosB+sinBcosA \\ sin(sin^{-1} x+cos^{-1} y) \\ sin(cos^{-1} y)= \sqrt{1- y^{2} } \\ cos(sin^{-1} x)= \sqrt{1- x^{2} } \\ =sin(sin^{-1} x)cos(cos^{-1} y)+sin(cos^{-1} y)cos(sin^{-1} x) \\ =xy+\sqrt{1- y^{2} } \sqrt{1- x^{2}} \\ =xy+ \sqrt{(1- y^{2})(1- x^{2})} [/tex]

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