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[" Ex."24" .fif (If) "cos^(-1)(x)/(a)+cos^(-1)(y)/(b)=alpha],[" fif(s "(1)/(8i)" (Prove that) "(x^(2))/(a^(2))-(2xy)/(ab)(cos alpha)+(y^(2))/(b^(2))=sin^(2)alpha],[(pi)/(8 pi):" fral "(dot s)/(dot theta),cos^(-1)(x)/(a)+cos^(-1)(y)/(b)=alpha]

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