$x\cdot2-11x+36$

$\frac{\left(x^2+4x+3\right)}{\sqrt{x}}$

$\lim_{h\to0}\left(\frac{-2\left(4+h\right)+\left(4+h\right)^2-8}{h}\right)$

$\frac{1-\sqrt{x-3}}{\sqrt{x^2-x-2}}$

$\frac{1}{\sin\left(x\right)}\left(\frac{1}{\cos\left(x\right)}\frac{\cos\left(x\right)}{1}\right)$

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

$7\cdot23-7\cdot19$