$\"\"$

The point in spherical coordinate system is $\"\"$ .

To convert spherical coordinate system to rectangular coordinate system, use the conversion equations $\"\"$ , $\"\"$ and $\"\"$ .

Substitute $\"\"$ in the above conversion equations.

Consider $\"\"$ .

$\"\"$

Consider $\"\"$ .

$\"\"$

Consider $\"\"$ .

$\"\"$

The point in rectangular coordinate system is $\"\"$ .

$\"\"$

The point in rectangular coordinate system is $\"\"$ .