If \( y=a \cos (\ln x)+b \sin (\ln x) x0 \) then the value of \( x^...

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If \( y=a \cos (\ln x)+b \sin (\ln x) x0 \) then the value of \( x^{2} \frac{d^{2} y}{d x^{2}}+x \frac{d y}{d x}+y \) is equal to:
\( \mathrm{P} \)
(1) 0
(2) 1
(3) -1
(4) 2
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