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If "sin"^(-1)(x/a) + "sin"^(-1) (y/b)=al...

If `"sin"^(-1)(x/a) + "sin"^(-1) (y/b)=alpha "prove that" x^2/a^2+(2xy)/(ab) "cos" alpha+y^2/b^2 ="sin"^2 alpha`

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