$4w\:-\:2w$
$-3a^2+2b-3c^3;\:a=3,\:b=-15,\:c=-2$
$\frac{dx}{dy}=\frac{1}{cos\:y}$
$\lim_{x\to0}\left(\frac{e^x-1}{x^4}\right)$
$+1\:+\:-9\:-\:+11\:+\:+10\:$
$\left(2ab-3b\right)^2$
$\int\left(\frac{x^3}{5-x^4}\right)dx$
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