Question

Please help! what is the trigonometric form of -4i?

Answer 1

ln[cos(4)-isin(4)

that is my guess

Answer 2

These are my options
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

I used
\[e ^{i \theta}=\cos(\theta)+isin(\theta)\]

Answer 4

which one would that be?

Answer 5

b looks like the only one that is right

Answer 6

Thank you

Answer 7

You need to know what values on the unit circle each degree equals for the sin and cos components

Answer 8

will you help with another?

Answer 9

this one is harder

Answer 10

sure make another thread and call me over

Answer 11

alright 1 second