Respuesta :

sqdancefan

Answer:

  True

Step-by-step explanation:

Evaluating the proposed trigonometric form, we get ...

  5(cos(270°) +i·sin(270°))

  = 5·cos(270°) +5i·sin(270°)

  = 5·0 +5i·(-2)

  = 5i

The statement is true.