$\frac{\cos^{2}x\sin x}{\cot^{2}x}=\sin^{3}x$
$169x^4-121n^2$
$30\::\:\left[\:\left(-\:12\:+\:9\right)\:-\:\left(3\:.\:3\:-12\::\:3\right)\:+\:2\right]\:+\:\left(\:-2\right)$
$-2x+y=2$
$\int\left(3x^{3}+2x+1\right)dx$
$\frac{3}{5}m^2+40m+\frac{1}{10}m^2+m^2$
$\frac{-80a^4b^5}{5a^3b}$
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