$2x+9>11$

$\left(x+z\right)\left(x+9\right)$

$\frac{d}{dx}\frac{2}{y^2}+3\sqrt{x}=2xy^3+\frac{y^2}{x^2}$

$\left(25x^2-10\right)^2$

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

$\lim_{x\to\infty}\left(x-\left(\left(x\right)\cdot e^{-\frac{1}{x}}\right)+e^{-\frac{1}{x}}\right)$