$\int\frac{1}{\left(1-2x\right)^3}dx$

$\int e\tan\theta\sec^{2}\thetad\theta$

$\lim_{x\to-\infty}\left(\frac{5x-2x^2+1}{x\left(3+x^2\right)}\right)$

$34abc-53bca+15cab-47ab$

$\left(-r^{2\:}-2r+3\right)\left(-r^{2\:}-3r+2\right)$

$30-2^2-1^3\cdot3$