$\"\"$

The polar coordinates are $\"\"$ .

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

The rectangular coordinates can be calculated by using the formula: $\"\"$ and $\"\"$ .

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

$\"\"$

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

$\"\"$

The rectangular coordinate of $\"\"$ is $\"\"$ .

$\"\"$

The rectangular coordinate of $\"\"$ is $\"\"$ .