DE of y = e^x (A cos x + B sin x)

1. A.
   $\dfrac{d^2y}{dx^2}-2\dfrac{dy}{dx}-y=0$
2. B.
   $\dfrac{d^2y}{dx^2}+2\dfrac{dy}{dx}+2y=0$
3. C.
   $\dfrac{d^2y}{dx^2}-2\dfrac{dy}{dx}+y=0$
4. D.
   $\dfrac{d^2y}{dx^2}-2\dfrac{dy}{dx}+2y=0$

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1. A.
   $\ x^{2}\frac{{\text{ }d}^{2}y}{\text{ }dx^{2}} + \left( 1 + y^{2} \right) = 0$
2. B.
   $\frac{d^{2}y}{\text{ }dx^{2}} - \frac{dy}{\text{ }dx} + y = 0$
3. C.
   $\frac{d^{2}y}{\text{ }dx^{2}} - 2\frac{\text{ }dy}{\text{ }dx} + 2y = 0$
4. D.
   $x\frac{{\text{ }d}^{2}y}{\text{ }dx^{2}} - 2\frac{\text{ }dy}{\text{ }dx} + 2y = 0$

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