$\left(x^2\:+\:1\right)\:\:dx\:+\:\left(x^2\:y^2\right)\:\:dy\:=\:0$
$\lim_{x\to\infty}\:\left(-3\right)^x$
$\lim_{x\to-2}\left(\frac{\left|x+2\right|}{x+2}\right)$
$\int e^{3x+40}dx$
$x^2y^2z^2+3x^2y^2z^2$
$35-10b+9x-5b$
$7a^2ab-14ab^2+21abc$
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