1.

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

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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