$\"\"$

The pair of points $\"\"$ and $\"\"$ .

The distance formula in polar form is $\"\"$ .

Substitute $\"\"$ and $\"\"$ in the distance formula.

$\"\"$

Find the value of $\"\"$ .

$\"\"$ .

Difference rule of trignometry : $\"\"$ .

$\"\"$

Substitute $\"\"$ in the distance formula.

$\"\"$

The distance between each pair of point is $\"\"$ .

$\"\"$

The distance between each pair of point is $\"\"$ is $\"\"$ .