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$(1-x)y^{\prime\prime}-4xy^\prime+5y=\cos(x)$	is a	differential equation with order
$x\frac{d^3y}{dx^3}-\left(\frac{dy}{dx}\right)^4=0$	is a	differential equation with order
$\frac{\partial^2 z}{\partial x^2}+\frac{\partial z}{\partial y}+y=\cos\!\left(x+y\right)$	is a	differential equation with order
$\frac{d^2y}{dx^2}=\sqrt{1+\left(\frac{dy}{dx}\right)^2}$	is a	differential equation with order
$\frac{dy}{dx}=\frac{\cos\!\left(y\right)}{y}$	is a	differential equation with order
$\frac{\partial^2 z}{\partial x\partial y}+\left(xy\right)^{2}=0$	is a	differential equation with order
$\dot{y}^{2}-4t\dot{y}+5y=t$	is a	differential equation with order
$\dot{y}-\left(1-\ddot{y}\right)\dot{y}=t^{3}-t$	is a	differential equation with order

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