If \( y=A \cos (\log x)+B \sin (\log x) \), then \( \mathrm{P} \) \...
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1If \( y=A \cos (\log x)+B \sin (\log x) \), then
\( \mathrm{P} \) \( x^{2} \frac{d^{2} y}{d x^{2}}+x \frac{d y}{d x}+y= \)
W
(A) 1
(B) 0
(C) -1
(D) 2
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