$8a^2\:-216b^3$
$\frac{x^4-1}{x^2}$
$\frac{sin\left(3b\right)cosb}{\cos\left(8b\right)}$
$3-2-1-6-5+4+8+7+4-6$
$\frac{2x^4\:+\:3x^3\:-\:2x\:-1}{x\:+\:2}$
$15a\cdot b+ac$
$x^2+2x<x+2$
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