$\frac{dy}{dx}+t^2x^3=0$
$xy'=y^2+y$
$\left(100a^4+7b\right)^2$
$3a^2\cdot a-2$
$\lim_{x\to0}\left(\frac{7x+sinx}{2x+cosx}\right)$
$3x\:-\:5x\:+\:7\:=\:17$
$\int\:\frac{x^3}{\sqrt{9+x^2}}dx$
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