Question

How do you convert `(−2, −9)` into polar form?

Answer 1

`sqrt 85 [cos (pi + arctan 4.5) + i sin (pi + arctan 4.5)]`

Explanation:

`-2 = r cos t, -9 = r sin t`

`tan t = 9/2`

`t = pi + arctan 4.5`
Where we add `pi` because our point is at 3rd quadrant.

`2^2 + 9^2 = r^2 = 85`