$\"\"$

The polar coordinates are $\"\"$ .

Here $\"\"$ and $\"\"$ .

The rectangular coordinates are : $\"\"$ and $\"\"$ .

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

$\"\"$

$\"\"$ .

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

$\"\"$

$\"\"$ .

The rectangular coordinates of $\"\"$ are $\"\"$ .

$\"\"$

$\"\"$ .