$2-\frac{1}{2}n=3n+16$
$4+4x-x^2$
$-\frac{120}{-60}$
$9x^2+36x-49$
$\lim_{x\to2}\:\frac{\left(t^2-1\right)e^{t^2}}{\left(x-2\right)}$
$\sec\left(x\right)\csc\left(x\right)+\cot\left(x\right)$
$-3\cdot\left(2x\right)^2$
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