Question

Express the complex number in trigonometric form.

-2.
options:

2(cos 90° + i sin 90°)

2(cos 0° + i sin 0°)

2(cos 180° + i sin 180°)

2(cos 270° + i sin 270°)

Answer 1

-2 is on the real axis. If you draw a vector from the origin to the point (-2,0), how long would the vector be?

Answer 2

2 units...?

Answer 3

Right, so \(r=2\). What angle does this vector make relative to the positive real axis?