$\frac{\left(x+1\right)\left(x+2\right)^2}{\left(x+3\right)\left(x+4\right)}$

$\int\left(\frac{6}{\sqrt{x}\sqrt{x-6}}\right)dx$

$\lim_{x\to0}\left(\frac{2x-1}{\sqrt{3x\:+1}}\right)$

$2+2s\le6$

$\left(\frac{2}{3}x^2\right)\left(-\frac{2}{6}xy\right)$

$\int_{0.1}^{0.3}\left(2e^{-3x}\right)dx$