$-\:2\:-\:1\:+\:3a\:-\:3$
$\left(a+b\right)\left(c+d\right)-a^2;a=1,b=-2,c=3,d=-4$
$\int\frac{1-x}{x^3-1}dx$
$\lim_{x\to-3}\left(\frac{x^2+6x+9}{x+3}\right)$
$\left(\sqrt{x}\right)\left(\sqrt{x}\right)$
$dy=\frac{y+2}{x+7}dx$
$64m^6-80m^3n^2+25n^4$
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