Given Points a = $\left( \sqrt { 5 } , \frac { \pi } { 6 } , \pi \right)$

Essay

Given points A = $\left( \sqrt { 5 } , \frac { \pi } { 6 } , \pi \right)$ and B = $\left( 2 , \frac { \pi } { 4 } , \frac { \pi } { 2 } \right)$ in spherical coordinates, find the distance between the two points.