Angle between two lines

The cartesian equations of two lines are

${\displaystyle \frac{x-1}{-3}}={\displaystyle \frac{y}{2}}={\displaystyle \frac{z+5}{2}}$‍ and

${\displaystyle \frac{x+4}{-2}}={\displaystyle \frac{y-5}{1}}={\displaystyle \frac{z}{-2}}$‍.

${\cos }^{-1}$‍