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If cos^-1 frac {x}{a} + cos^-1 frac {y}{...

If `cos^-1 frac {x}{a} + cos^-1 frac {y}{b}= alpha`, prove that : `frac {x^2}{a^2}- frac{2xy}{ab} cos alpha + frac {y^2}{b^2}= sin^2 alpha`

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