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[" 17.If "cos^(-1)(x)/(a)+cos^(-1)(y)/(b...

[" 17.If "cos^(-1)(x)/(a)+cos^(-1)(y)/(b)=alpha" ,prove that "(x^(2))/(a^(2))-(2xy)/(ab)cos alpha+(y^(2))/(b^(2))=sin^(2)alpha],[" 18.If "tan^(-1)a+tan^(-1)b+tan^(-1)c=pi," prove that "a+b+c=abc]

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