$\frac{\left(17+z\right)}{\left(5-11z\right)}<=-\frac{1}{2}$

$\:x^2+3x+3>\:0$

$\int\frac{5x-4}{\left(x+1\right)\left(x-3\right)}dx$

$\frac{sin^2cot}{tan}$

$\frac{tan\left(x\right)\:+\:cot\left(x\right)}{sec\left(x\right)}$

$\lim_{x\to\infty}\ln\left(\cos\:\left(\frac{2}{x}\right)\right)x^3$

$2x^2-2x-24$