If \( y=a \cos (\log x)+b \sin (\log x) \), then
\( \mathrm{P} \)
W...
If \( y=a \cos (\log x)+b \sin (\log x) \), then
\( \mathrm{P} \)
W \( x^{2} \cdot y_{n+2}+(2 n+3) x \cdot y_{n+1}+\left(n^{2}+1\right) y_{n}= \)
(A) 0
(B) 1
(C) -1
(D) 2
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