$x^2+18x+4=0$

$\left(x+y\right)\left(x-y\right)+\left(3x-2y\right)\left(2y+3\right)$

$l\left\{\left(e^t-e^{-t}\right)^2\right\}$

$x^2+x+1\ge0$

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

$5x+8<2x-6$

$\left(\frac{m^2-1}{m^2+1}\right)^2+\left(\frac{2m}{m^2+1}\right)^2$