If \( y=a \sin x+b \cos x \), then \( y^{2}+\left(\frac{d y}{d x}\r...

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If \( y=a \sin x+b \cos x \), then \( y^{2}+\left(\frac{d y}{d x}\right)^{2} \) is a
\( \mathrm{P} \)
IV
(A) Function of \( x \)
(B) Function of \( y \)
(C) Function of \( x \) and \( y \)
(D) Constant
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