$\lim_{x\to-1}\left(5x^2+2\right)\:\left(x^2+1\right)$
$\pi+0$
$20\left(3a\right)^3\left(4b^2\right)^3$
$+9-5\cdot\left(-2\right)-3\cdot\left(-1\right)-5\cdot2+7$
$dy=3y^2t\:dt$
$\frac{1-cos2a}{cos^2a}$
$\int\frac{2x}{\left(x-2\right)\left(x^2+4\right)}dx$
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