user212 user212
  • 11-06-2017
  • Mathematics
contestada

Express the complex number in trigonometric form: -4i
I think the answer is 4(cos 180 + i sin 180)

Respuesta :

egenriether
egenriether egenriether
  • 11-06-2017
Since the sin term is imaginary and cos is real, you need an angle that makes cos=0 and sin -1. This is 270 degrees. So
-4i=4(cos(270)+isin(270))
Answer Link
emmacmcguire emmacmcguire
  • 10-03-2020

Answer:

4(cos 270° + i sin 270°)

Step-by-step explanation:

Answer Link

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