$\frac{x^3}{3+x}$
$\frac{1}{\cos\left(x\right)}+\cos\left(x\right)$
$x^2+2x+36$
$-1+8-3+3-2+1-9+5$
$a^2-7a^2-30$
$8x^2y+4xy^2-5x^2y-6x^2y+3x^2y-6xy^2$
$\frac{\cos\left(x\right)}{tan\left(x\right)}=cos\left(x\right)$
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