$\frac{tanx}{1+secx}+\frac{\left(1+secx\right)}{tanx}$

$\left(\frac{2}{x}+3x^2\right)$

$-x\le-4$

$\left(\frac{x^2+x\cdot\sin\left(x\right)}{\cos\left(x\right)-1}\right)$

$\left(x+3ab\right)\left(x+5cd\right)$

$\int\frac{24}{3x+x\sqrt{x}}dx$

$\left(3x-1\right)^2-\left(3x+1\right)^2\:$