The rectangular coordinates of a point: rectangular_coordinates

### 13.13.5 The rectangular coordinates of a point: rectangular_coordinates

The rectangular_coordinates command finds the rectangular coordinates of a point given its polar coordinates.

- rectangular_coordinates takes two arguments:
  r, θ, two real numbers.
- rectangular_coordinates(r,θ) returns a list of the rectangular coordinates of the point with polar coordinates r and θ.

Example.
Input:

rectangular_coordinates(2, pi/4)

or:

rectangular_coordinates(polar_point(2, pi/4))

Output:

⎡ ⎢ ⎢ ⎣ |
2
2
|  | √ |
2
| , |
2
2
|  | √ |
2
| ⎤ ⎥ ⎥ ⎦