$-33-\left(-26\right)$

$508+267+292$

$b^4+2b^2+9$

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

$\lim_{x\to0}\left(cot\:x\frac{1}{x}\right)$

$\int\frac{2t^2-8t-8}{\left(t-2\right)\left(t^2+4\right)}dx$

$m\tan\left(50\right)=\tan\left(70\right)-\tan\left(20\right)$