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" 12."quad " (i) "quad " If "cos^(-1)((x...

" 12."quad " (i) "quad " If "cos^(-1)((x)/(a))+cos^(-1)((y)/(b))=theta," prove that "(x^(2))/(a^(2))-(2xy)/(ab)cos theta+(y^(2))/(b^(2))=sin^(2)theta

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