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anonymous

  • one year ago

Thanks for helping! I need to convert complex numbers into rectangular form. I'm stuck on this one: 5(cos(5pi/4)+isin(5pi/4))

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  1. anonymous
    • one year ago
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    @Hero @perl @jim_thompson5910 @ganeshie8 @aaronq @zepdrix

  2. anonymous
    • one year ago
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    @TheSmartOne @Loser66 @Luigi0210

  3. misty1212
    • one year ago
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    HI!!

  4. anonymous
    • one year ago
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    hi

  5. misty1212
    • one year ago
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    this is not nearly as hard as it looks evaluate the functions and distribute is all

  6. misty1212
    • one year ago
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    do you know \(\cos(\frac{5\pi}{4})\)?

  7. anonymous
    • one year ago
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    -1/sqrt(2)

  8. misty1212
    • one year ago
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    yeah most people write \(-\frac{\sqrt 2}{2}\) but it is the same thing

  9. anonymous
    • one year ago
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    I'm sort of confused about the isin though

  10. misty1212
    • one year ago
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    how about \(\sin(\frac{5\pi}{4})\)

  11. anonymous
    • one year ago
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    Is there a formula I need to follow?

  12. anonymous
    • one year ago
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    -sqrt(2)/2

  13. misty1212
    • one year ago
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    let me ask you a question how is it you know the sine, but not the cosine?

  14. anonymous
    • one year ago
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    ?

  15. misty1212
    • one year ago
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    or the other way around seems like if you are able to find one, you should be able to find the other it is not like one is more difficult or something

  16. misty1212
    • one year ago
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    yeah they are both \(-\frac{\sqrt 2}{2}\)

  17. anonymous
    • one year ago
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    so I just plug it in and simplify?

  18. misty1212
    • one year ago
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    so \[5\left (-\frac{\sqrt2}{2}-i\frac{\sqrt 2}{2}\right)\]

  19. anonymous
    • one year ago
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    ok

  20. misty1212
    • one year ago
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    then distribute

  21. misty1212
    • one year ago
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    that is all yes

  22. anonymous
    • one year ago
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    oh cool

  23. anonymous
    • one year ago
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    thanks!

  24. misty1212
    • one year ago
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    \[\color\magenta\heartsuit\]

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