Question

Express the complex number in trigonometric form.

-3i

Answer 1

@zepdrix Hey can you help?

Answer 2

I think the answer is 3(cos 90° + i sin 90°) but I just need confirmation from someone cause I'm not 100% sure. :)

Answer 3

Hmm so we're moving along the Imaginary axis, in the negative direction, 3 units.
So I think we're moving straight DOWN 3 units.

So our angle would need to be \(-90^o\) or \(270^o\)
:o

Answer 4

3(cos 180° + i sin 180°)

3(cos 270° + i sin 270°)

3(cos 90° + i sin 90°)

3(cos 0° + i sin 0°)

Answer 5

Those are my answer choices

Answer 6

Hmm, one of them has a 270 c;
Hmmmmm

Answer 7

Lol so it's that one? 3(cos 270 + i sin 270) ?

Answer 8

Yah I think so c: