Question

Express the complex number in trigonometric form.

-4i

Answer 1

-4i = 4(cos(3Pi/2)+i sin(3Pi/2))

Answer 2

these are my answer choices?
4(cos 180° + i sin 180°)

4(cos 270° + i sin 270°)

4(cos 90° + i sin 90°)

4(cos 0° + i sin 0°)

Answer 3

3Pi/2 = 270º
so
4(cos 270° + i sin 270°)

Answer 4

oohh okay duhh, thank you!! could you help me on another if u have a min?

Answer 5

k

Answer 6

Express the complex number in trigonometric form.

5 - 5i

i thought the answer was 5sqrt2(cos5pi/4+isin5pi/4)

Answer 7

??

Answer 8

put it this way:
5(1-i)
what do you think now?

Answer 9

wait? huh

Answer 10

these are the answer choices;

5sqrt2(cos5pi/4+isin5pi/4)

5sqrt2(cos7pi/4+isin7pi/4)

5(cos5pi/4+isin5pi/4)

5(cos7pi/4+isin7pi/4)

Answer 11

what is this angle