Question

Find the product of z1 and z2 where z1 =2(cos80° + i sin 80°), and z2 = 9(cos 110° + i sin 110°).

11(cos 190° + i sin 190°)

18(cos 8800° + i sin 8800°)

18(cos 190° + i sin 190°)

18(cos 80° + i sin 80°)

Answer 1

Multiply the moduli and add the angles.

Answer 2

the moduli?

Answer 3

The 2 and the 9

Answer 4

18(cos 190° + i sin 190°) ??

Answer 5

yep

Answer 6

okay what about this one?
Express the complex number in trigonometric form.

6 - 6i

Answer 7

Draw a picture of it first.

Answer 8

Where is your picture?

Answer 9

idk how to do that...