$2a^2-7a+6$

$\int x\cdot\left(x+2\right)^{-2}dx$

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

$\frac{\cos\left(x\right)}{\cot\left(x\right)\sin\left(x\right)}$

$\frac{d}{dx}\left(\frac{x^2\sqrt{7x-4}}{\left(1+x^2\right)^4}\right)$

$4x-3>2\left(x+3\right)$

$\lim_{x\to1}\left(\frac{x-1}{\sqrt{x}-\sqrt{2-x}}\right)$