\cos ^{-1} \frac{x}{a}+\cos ^{-1} \frac{1}{b}=\alpha\frac{x^{2}}{a^{2} – InterviewSolution

1.	\cos ^{-1} \frac{x}{a}+\cos ^{-1} \frac{1}{b}=\alpha\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}-\frac{2 x y}{a b}
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