$\lim_{x\to0}\left(\frac{1-cos\left(t\right)}{sin\left(t\right)}\right)$
$\int\left(4x^2+5x\right)dx$
$3x+2y+z=5$
$m=\:-2\:\:\:2m+n$
$\left(3x^2+\frac{1}{2}\right)\left(3x^2-\frac{3}{4}\right)$
$cos\left(44\right)cos\left(14\right)+sin\left(44\right)sin\left(14\right)$
$4s^2+28s+49$
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