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Differential cquation associatcd with primitive \( y=\mathrm{Ac}^{3 \mathrm{x}}+\mathrm{Bc}^{5 \mathrm{x}} \) :
(A) \( \frac{d^{2} y}{d x^{2}}-8 \frac{d y}{d x}+15 y=0 \)
(B) \( \frac{d^{2} y}{d x^{2}}+8 \frac{d y}{d x}-15 y=0 \)
\( \mathrm{P} \)
(C) \( \frac{d^{2} y}{d x^{2}}+8 \frac{d y}{d x}+y=0 \)
(D) none of these
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