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ballerinaxbb

  • 3 years ago

Express the complex number in trigonometric form. -3i

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  1. ballerinaxbb
    • 3 years ago
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    @zepdrix Hey can you help?

  2. ballerinaxbb
    • 3 years ago
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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. :)

  3. zepdrix
    • 3 years ago
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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

  4. ballerinaxbb
    • 3 years ago
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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°)

  5. ballerinaxbb
    • 3 years ago
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    Those are my answer choices

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

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

  8. zepdrix
    • 3 years ago
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    Yah I think so c:

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