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

$\int_1^2\left(\frac{1}{\left(x-2\right)^2}\right)dx$

$\lim_{x\to\frac{\pi\:}{3}}\left(\frac{1\:-\:2x}{\pi\:\:-\:3x}\right)$

$\tan\left(x\right)=-\frac{11}{13}$

$12-12y+10x-5y+8$

$\int\left(\frac{\left(\frac{59}{4}x+\frac{45}{4}\right)}{\left(x^2+x+2\right)}\right)dx$

$m^2+8m-180$