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

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Answer 1 · 2017-08-22T12:02:13

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

$-1$ 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.

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