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ballerinaxbb

Express the complex number in trigonometric form. -3i

  • one year ago
  • one year ago

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  1. ballerinaxbb
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    @zepdrix Hey can you help?

    • one year ago
  2. ballerinaxbb
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    I think the answer is 3(cos 90° + i sin 90°) but I just need confirmation from someone cause I'm not 100% sure. :)

    • one year ago
  3. zepdrix
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    Hmm so we're moving along the Imaginary axis, in the negative direction, 3 units. So I think we're moving straight DOWN 3 units. So our angle would need to be \(-90^o\) or \(270^o\) :o

    • one year ago
  4. ballerinaxbb
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    3(cos 180° + i sin 180°) 3(cos 270° + i sin 270°) 3(cos 90° + i sin 90°) 3(cos 0° + i sin 0°)

    • one year ago
  5. ballerinaxbb
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    Those are my answer choices

    • one year ago
  6. zepdrix
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    Hmm, one of them has a 270 c; Hmmmmm

    • one year ago
  7. ballerinaxbb
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    Lol so it's that one? 3(cos 270 + i sin 270) ?

    • one year ago
  8. zepdrix
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    Yah I think so c:

    • one year ago
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