$\frac{\sqrt{x-6}\sqrt{x+6}}{\left(x-36\right)\left(x+36\right)}$

$\frac{dy}{dx}+\left(\frac{1}{2\sqrt{x}}\right)y=\left(\frac{1}{2\sqrt{x}}\right)$

$\lim\:_{x\to\:\:-\infty\:\:}\left(2\sqrt{x^2-3x}\right)$

$1-7\left(8+4\right)$

$\int\frac{6x-1}{\left(x+1\right)^2}dx$

$\log\left(30-x\right)-\log\left(x\right)=\log\left(x-2\right)$