XV. If cos-1ă + cos-1= «, show that...
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XV. If cos-1ă + cos-1= «, show that i hay cosos += =sinoc.

JEE/Engineering Exams
Maths
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( frac{0}{a}+cos ^{-1} frac{x}{a}+cos frac{y}{b}=alpha ) LHS ( cos ^{-1}left(frac{x, y}{a^{x} b}-sqrt{frac{1-x^{2}}{a^{2}}}right)^{frac{y^{2}}{b^{2}}}=2 ) ( frac{x y}{q b}=cos alpha+sqrt{left(1-frac{x^{2}}{9 y}right)left(1-frac{y^{2}}{b}right)} ) Both sigte square
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