$\int\frac{5x^2+3x-1}{\left(1+x^2\right)\left(x-2\right)}dx$

$\int-csc\left(6x\right)cot\left(6x\right)dx$

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

$\left(a+b+c+d\right)\left(a+b+c-d\right)$

$\int_{0}^{\infty}\frac{1}{2x-1}dx$

$4-\left(-2\right).\left|-8-3.\left(5-7\right)\right|$

$\left(5x+2y+3\right)\left(5x+2y+1\right)$