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13 January, 12:49

Express the complex number in trigonometric form. - 5i

a. 5 (cos 270° + i sin 270°)

b. 5 (cos 180° + i sin 180°)

c. 5 (cos 90° + i sin 90°)

d. 5 (cos 0° + i sin 0°)

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Answers (1)
  1. 13 January, 14:31
    0
    Cos 270 = 0 and sin 270 = - 1

    so - 5i from a part.
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