$\frac{5}{1-x}<\frac{5}{x+21}$
$\int\frac{x^2}{\left(\left(x+1\right)^2+1\right)^2}dx$
$5ab+6xy=6xy+5ab$
$cos3x\:=\:-1$
$x^2-2x+7$
$\left(az^2\right)-\left(b^2\right)^3$
$-4x-\left(2x-4\right)-6\left(-x+1\right)+2$
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