{[" 1) "22" ,ze "cos^(-1)(x)/(a)+cos^(-1...

{[" 1) "22" ,ze "cos^(-1)(x)/(a)+cos^(-1)(y)/(b)=alpha" ,तो Prove that : "],[qquad (x^(2))/(a^(2))+(y^(2))/(b^(2))-(2xy)/(ab)cos alpha=sin^(2)alpha]

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