$\ln\left(9x\right)$

$12\:+\:-9\:+\:-1\:+\:13$

$3a-7\left[\left(3x-2y-4x+7y\right)-2c\right]$

$\int\frac{8x+27}{x^3+6x^2+9x}\:dx$

$\lim_{x\to6}\left(\frac{x-6}{x^2-x+30}\right)$

$\frac{d}{dx}\left(\frac{1}{\left(x+6\right)\left(x+7\right)\left(x+2\right)}\right)$

$\int\left(49+x^2\right)^7dx$