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If p and q are the order and degree of the differential equation \(y\frac{dy}{dx}+x^3\frac{d^2y}{dx^2} + xy=cos\,x,\) thenA. p < qB. p = qC. p > qD. None of theses |
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Answer» Correct answer is C. y(dy/dx) + x3(d2y/dx2) + xy = cos x, Order = Highest order derivative present in the differential equation. ∴ Order = 2 = p Degree = Highest power of highest order derivative which is \(\frac{d^2y}{dx^2}\) ∴ Degree = 1 = q ∴ p = 2 > q = 1 |
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