$\frac{\sin\left(2x\right)}{\cos\left(2x\right)}$
$-3.8+-2.19$
$m-n+p-m+n-p+2m-2n+2p$
$-2\:x\:-\infty$
$14x^2\left(18x^3+15y^3\right)$
$x^{2}-17-60$
$\lim_{x\to2}\left(\frac{x}{1-\cos\left(x-2\right)}\right)$
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