$\frac{-x^2+1}{x^2+x-2};x=-1$
$12b^2-7b+1$
$3ab+4a+15b+20$
$19^2y^2$
$\int\left(\frac{\left(2x-8\right)}{\left(x^2-8x+15\right)^4}\right)dx$
$4m^2-28m+49$
$-\:\left(32\:+\:25\right)\:-\:\left[-10\:+6\:-9\right]$
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