Question

How do you write `-1` in trigonometric form?

Answer 1

`(r,theta)=color(red)(""(1,pi))`

Explanation:

`-1` in the Complex plane is a point on the negative X-axis (with no "imaginary" component).

The negative X-axis is at an angle of `pi` radians (or `180^@`) from the standard base, the positive X-axis.

`-1` is a distance of `1` unit from the origin and this is what you use as the radius.