$\lim_{x\to6}\cos\left(5x\right)$
$\lim_{x\to0}\left(\frac{sin\left(cx\right)}{kx}\right)$
$25+34-\left(54-3\cdot5\left(3+2\cdot\left(3-1\right)+2\right)\right)$
$2n+5n-3n$
$7m^2-14n+2m^3-4mn$
$y\frac{dy}{dx}+x=5$
$\left(3x\:+\:\frac{4}{7}\right)\:\ge\:\:-1$
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