$\int_{-1}^2\left(xe^x\right)dx$

$-3\left(9+6b\right)+5\left(-4b-2\right)$

$\tan\left(\theta\right)\:\sin\left(\theta\right)\:+\:\cos\left(\theta\right)=\sec\left(\theta\right)$

$\frac{dy}{dx}\left(yx^2\:+\:y\:=\:1\:+\:x^2\right)$

$x^2y-\frac{12x}{y}$

$\frac{2}{\pi}\sin\left(\frac{\pi}{2}x\right)=\frac{1}{\pi}$

$+6m^2n-21m^2n+5m^2$