$\frac{sin}{1-\cos}=1+cos$
$\lim_{x\to0}\left(\frac{x}{4+\sin\left(x\right)}\right)$
$12.75+12.75+60+60$
$n^2+3n-n+2n^2+7$
$sec^2\left(x\right)\left(2+csc\left(x\right)\right)\:$
$12\cdot\left(16+4\right)$
$\left|\frac{1}{2}-1\right|$
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