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°)

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°)

anonymous · Answer

-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?

anonymous · Answer

2 units...?

anonymous · Answer

Right, so $r=2$. What angle does this vector make relative to the positive real axis?|dw:1405901619517:dw|