$\lim_{x\to3}\left(x^2+2x-1\right)$
$y=\frac{x^2+7x+12}{x+3}$
$\int dr$
$\left(-x\right)^3+3\cdot2\cdot x^2-3\cdot2\cdot x^2+2^3$
$\frac{tan^2\theta+1}{\tan^2\left(\theta\right)}\:\:$
$\lim_{x\to0}\left(\cos\left(2x\right)^{3x}\right)$
$y^2-4y^2-21$
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