$\"\"$

Observe the graph :

The function resembles Special type of polar equation is circle.

The general form of circle is $\"\"$ .

The point on the polar equation is $\"\"$ .

Consider $\"\"$ .

Subtitute $\"\"$ in $\"\"$ .

$\"\"$

Substitute $\"\"$ in the $\"\"$ .

$\"\"$

The polar equation $\"\"$ . $\"\"$

The polar equation is $\"\"$ .