$\"\"$

The polar coordinates of point is $\"\"$ .

Let the polar coordinates of point is $\"\"$ .

Polar-to-rectangular coordinates : $\"\"$ and $\"\"$ .

Where angle $\"image\"$ is in radians.

Substitute $\"\"$ and $\"\"$ .

$\"\"$ and $\"\"$

The rectangular coordinates of the point $\"\"$ is $\"\"$ .

$\"\"$

The rectangular coordinates of the point $\"\"$ is $\"\"$ .