$\lim_{x\to0}\left(\frac{x^3-x^2+x-1}{x^3+x^2}\right)$

$\int\frac{3x^2}{x^2-4x}dx$

$a^2-10a+16$

$\csc\left(y\right)dx=-\sec\:^2\left(x\right)dy$

$\left(m^3+3\right)\left(m^3+5m\right)$

$\lim_{x\to2}\left(\frac{x^2-4}{\sqrt{x-1}-1}\right)$

$-\left(5x-2\right)^2-3\left(3x-2\right)\left(3x+2\right)+4\left(x+1\right)^2$