Home > Trigonometry > The Trigonometric Form of Complex Numbers

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

Answer 1

Brooklyn Anderson

#(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.

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Emery Adkins

-1 can be written in trigonometric form as:

-1 = cos(π) + i * sin(π)

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.