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Itel Group Title

Express the complex number in trigonometric form. -4

  • 2 years ago
  • 2 years ago

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  1. frx Group Title
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    So, do you know how to find the the angle?

    • 2 years ago
  2. frx Group Title
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    Try to think of the unitcircle

    • 2 years ago
  3. frx Group Title
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    -4 is simply just a scaled-up -1 so that means that the angle is what?

    • 2 years ago
  4. Itel Group Title
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    180 degrees?

    • 2 years ago
  5. Itel Group Title
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    @frx

    • 2 years ago
  6. frx Group Title
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    Exactly

    • 2 years ago
  7. frx Group Title
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    Or pi since you're looking for the polarform

    • 2 years ago
  8. Itel Group Title
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    Thanks. These are the possible answers: 4(cos 270° + i sin 270°) 4(cos 90° + i sin 90°) 4(cos 0° + i sin 0°) 4(cos 180° + i sin 180°) So how do I find out which one of those is the answer if it is pi or 180 degrees? thanks again

    • 2 years ago
  9. frx Group Title
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    \[|z|=\sqrt{4^{2}}=4\] \[\arg(z)= \pi \] \[4(\cos \pi+isin \pi)\]

    • 2 years ago
  10. frx Group Title
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    So since your alternatives are in degrees and not radians you know it's 180 degrees.

    • 2 years ago
  11. frx Group Title
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    So it's the last one of your options

    • 2 years ago
  12. Itel Group Title
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    Oh i see what you did. Thank you so much man. I really appreciate your help. Very thorough explanation.

    • 2 years ago
  13. frx Group Title
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    No problem :)

    • 2 years ago
  14. frx Group Title
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    If you have any questions just send a pm

    • 2 years ago
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