$\frac{gmr}{r^3}$

$sec^3\left(x\right)\:-\:sec^2\left(x\right)-\sec\left(x\right)+1$

$\left(3+5i\right)-\left(7+2i\right)$

$1-\left(0-7\right)+7+\left(-1+2-5\right)$

$\int_0^{\infty}\left(\frac{sin\left(x\right)}{x^2}\right)dx$

$2z^2-38=0$

$ln\left(x\right)\:+\:ln\left(x+3\right)\:=\:ln\left(20-5x\right)$