$x^3+6x^2-x+2+2x^2+4x-3\cdot\:\:x^3+6x^2-x+2-2x^2+4x-3$
$\left(2z+1\right)\left[2z-\frac{1}{2}\right]$
$5x^2-41x+8$
$3-\sqrt{9x^2}$
$\lim\:_{x\to\:0}\left(\frac{\sin\:\left(t^2\right)}{t}\right)$
$x^3+x^2-x^7$
$\frac{3x+2}{x^3-x^2+5x}$
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