Let cos^-1(x/a)+cos^-1(y/b)=alpha thenAn...

Let `cos^-1(x/a)+cos^-1(y/b)=alpha` thenAnswer the following questions (A) `x^2/a^2+y^2/b^2+(2xy)/(ab) cos alpha = sin^2 alpha` (B) `x^2/a^2-y^2/b^2+(2xy)/(ab) cos alpha = sin^2 alpha` (C) `x^2/a^2+y^2/b^2-(2xy)/(ab) cos alpha = sin^2 alpha` (D) `x^2/a^2-y^2/b^2-(2xy)/(ab) cos alpha = sin^2 alpha`

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