$\lim_{x\to\infty}\:\:\frac{\left(\left(2+x\right)x\right)}{\left(1+x\right)^{\left(4\right)}}$

$\int\left(1+\tan^2\left(x\right)\right)\cdot\tan\left(x\right)dx$

$\left(2y\right)\left(y^2\right)$

$x^2+26x+144$

$-3x^2+7x+6=0$

$\frac{x^3-x^2+2x^2-2}{x^2+1}$

$\lim_{x\to1}\left(\frac{1-x}{\left|x-1\right|}\right)$