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If cos^(-1)(x/2)+cos^(-1)(y/3)=theta , t...

If `cos^(-1)(x/2)+cos^(-1)(y/3)=theta` , then `9x^2-12 x ycostheta+4y^2` is equal to (a) 36 (b) `-36\ s in\ ^2theta` (c) `36\ sin\ ^2theta` (d) `36\ cos\ ^2theta`

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To solve the problem, we start with the given equation: \[ \cos^{-1}\left(\frac{x}{2}\right) + \cos^{-1}\left(\frac{y}{3}\right) = \theta \] We need to find the value of the expression: ...
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