$\frac{x^2+9x+18}{x+6}$

$3\ln\left(a\right)-\ln\left(c\right)+2\ln\left(v\right)-2\ln\left(a\right)+2\ln\left(v\right)$

$tan\left(t+v\right)=\frac{tan\:t\:+\:tan\:v}{1-tan\:t\:tan\:v}$

$f\left(x\right)=\frac{cos\left(x\right)-cos\left(6x\right)}{x^2}$

$\left(\:5m\:-\:8n\right)^2$

$y'+2xy=e^{-x^2}$

$b^2-49=0$