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[" 96"cos^(-1)((x)/(a))+cos^(-1)([y],[b]...

[" 96"cos^(-1)((x)/(a))+cos^(-1)([y],[b])=alpha" a "],[" prove that "(x^(2))/(a^(2))-(2my)/(ab)cos x+(y^(2))/(b^(2))=sin^(2)x]

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