If \cos ^{-1} \frac{x}{2}+\cos ^{-1} \frac{y}{3}=\phi, then 9 x^2-12 x y \cos \phi+4 y^2 is equal to

NIMCET 2022 Question Paper with solutions

Question : 10 of 120

Marks: +1, -0

\cos ^{-1} \;{x}/{2}+\cos ^{-1} \;{y}/{3}=φ

, then

9 x^2-12 x y \cos φ+4 y^2

is equal to

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