Which of the following is an autonomous differential equation?
dydx=x+y\frac{dy}{dx} = x + ydxdy=x+y
dydx=3y\frac{dy}{dx} = 3ydxdy=3y
dydx=y+sin(x)\frac{dy}{dx} = y + \sin(x)dxdy=y+sin(x)
dydx=x2\frac{dy}{dx} = x^2dxdy=x2