1.

Which of the following differential equations has y = x as one of its particular solution?(A) \(\frac{d^2y}{dx^2} - x^2\frac{dy}{dx} + xy = x\)(B) \(\frac{d^2y}{dx^2} + x\frac{dy}{dx} + xy = x\)(C) \(\frac{d^2y}{dx^2} - x^2\frac{dy}{dx} + xy = 0\)(D) \(\frac{d^2y}{dx^2} + x^2\frac{dy}{dx} + xy = 0\)

Answer»

Answer is (C)

y = x y1 = 1 y2 = o 

this is satisfied by 

y2 – x2 y, + xy = 0 

0 – x2 . 1 + x . x = 0



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