\( y^{2}=P(x) \) is a polynomial of degree 3 , then
\[
2 \frac{d}{d x}\left(y^{3} \frac{d^{2} y}...
\( y^{2}=P(x) \) is a polynomial of degree 3 , then
\[
2 \frac{d}{d x}\left(y^{3} \frac{d^{2} y}{d x^{2}}\right)
\]
(A) \( P(x)+P^{\prime \prime}(x) \)
(B) \( P(x) \)
(C) \( P(x) P^{\prime \prime \prime}(x) \)
(D) a constant
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