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[" (b) "AAquad Cos^(-1)(x)/(a)+Cas'(y)/(...

[" (b) "AAquad Cos^(-1)(x)/(a)+Cas'(y)/(b)=alpha," Prove that "],[(x^(2))/(a^(2))-(2xy)/(ab)cos x+(y^(2))/(b^(2))=sin^(2)alpha]

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