$\log\left(\frac{r\sqrt{7}}{s^2}\right)$

$\frac{x^3+x-10}{x-2}$

$\frac{\left(-12a^4b^3c^4\right)}{\left(3a^3b^2c^5\right)}$

$b\left(c-1\right)+c\left(c-1\right)$

$5\sin\:^2\left(\theta\:\right)-2\cos\:\left(\theta\:\right)=0$

$2x-1+\:2x^2-5x+3$

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