$\lim_{x\to3}\left(\frac{\log\left(x-3\right)}{\cot g\left(x-3\right)}\right)$

$\int_{-\infty}^{-1}\left(\ln\left(\left|x\right|\right)e^x\right)dx$

$-3\:-\:\left(-2\right)\:+\:\left(-1\right)\:+\:8\:+\:\left(-11\right)$

$\left(-1-2\right)^2-3$

$\left(\csc\left(a\right)-\cot\left(a\right)\right)\left(\csc\left(a\right)\right)$

$\left(z+3\right)\left(z+5\right)=z^2+8z+15$

$\int\frac{\left(2x-1\right)}{3x^2+4}dx$