$\frac{x^3-5x^2}{x}$
$\frac{3\pi}{2}+\pi$
$\frac{dz}{ds}\:=x^2+xy+y^2$
$x^2-4x\ge12$
$\frac{\sin\left(2x\right)-\cos\left(2x\right)+1}{\cos\left(2x\right)+\sin\left(2x\right)+1}=\tan\left(x\right)$
$\left(x+2y\right)\sqrt{x+2y}$
$x^2\:-\:2x\:-\:4$
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