XV. ircos-ež + cos=1&=x, show that ...
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XV. ircos-ež + cos=1&=x, show that a cose Ensinde. XV. If cos-12 cos-12 = 0, show that - СО * na = sino ab

JEE/Engineering Exams
Maths
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( frac{0}{L H S} frac{cos 1}{frac{x}{a}+cos frac{y}{b}=alpha} ) ( cos ^{-1}left(frac{x y}{a}-sqrt{1-frac{x^{2}}{a^{2}}} intleft(-frac{y^{2}}{b^{2}}right)=alpharight. ) ( frac{x y}{9 b}=cos alpha+sqrt{left(1-frac{x^{2}}{9 y}right)left(1-frac{y^{2}}{b}right)} ) Beth sigte gruare ( therefore ) Ste ( frac{x y}{a b}-cos alpha=sqrt{left(frac{-x^{2}}{a x}right)left(1-frac{g}{b^{2}}right)} ) ( frac{x^{2} y^{2}}{4^{2} b^{2}}+cos ^{2} alpha-frac{2 x y}{9 b} cos alpha= )
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