$f\left(x\right)=\:\left(-x-6\right)^2-4$
$tan\:cot\left(x\right)=\tan\left(x\right)$
$\frac{3x}{\left(x+\sqrt{2}\right)}$
$-7+\left[-3+\left(-5+1\right)-\left(3-1\right)\right]$
$\sqrt{2450}$
$\frac{dy}{dx}=2\:sec^2\left(x\right)e^{2y}$
$\lim_{x\to2}\left(x^2+3x+1\right)$
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