Question

Express the complex number in trigonometric form.
-4

Answer 1

Do you have any answer choses? Or you have to write?

Answer 2

i do one second. :)

Answer 3

4(cos 270(degrees) + i sin 270 (degrees))
4(cos 90(degrees)+ i sin 90(degrees))
4(cos 0(degrees) + i sin 0(degrees))
4(cos 180(degrees) + i sin 180(degrees))

Answer 4

You still there?

Answer 5

i think it is the last option but i am not sure >.<

Answer 6

i would appreciate if you show your work :D

Answer 7

\[-4=4\left( -1+0 i \right)=r(\cos \theta+i \sin \theta),\cos \theta=-1=\cos 180,\sin \theta=0=0,180\]
\[\theta=180\]
r=4
?

Answer 8

that's how i got 180 :D so was i right :)

Answer 9

Thanks anyways! :)