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If \( \mathrm{m} \) and \( \mathrm{n} \) are order and degree of the equation
\[
\left(\frac{d^{2} y}{d x^{2}}\right)^{5}+4 \cdot \frac{\left(\frac{d^{2} y}{d x^{2}}\right)^{3}}{\frac{d^{3} y}{d x^{3}}}+\frac{d^{3} y}{d x^{3}}=x^{2}-1
\]
\( \mathrm{P} \)
(A) \( \mathrm{m}=3, \mathrm{n}=3 \)
(B) \( \mathrm{m}=3, \mathrm{n}=2 \)
(C) \( \mathrm{m}=3, \mathrm{n}=5 \)
(D) \( \mathrm{m}=3, \mathrm{n}=1 \)
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