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Thread: Arguments for complex numbers

  1. #1
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    Arguments for complex numbers

    Hi everyone

    For

    a) - 9 = the argument is pi
    9(cos pi+ isin pi)
    b) 12i the arg is pi/2
    12(cos (pi/2) + isin (pi/2) )

    What is the argument for
    a) -9
    b) -12i

    Anyone can help advise me? Im doing my revision...

    Thank you so much.
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  2. #2
    Senior Member Twig's Avatar
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     -9 ? Didnt you just answer that yourself? The argument is  \pi .

    z = -12i this gives the argument  12(cos(\frac{3\pi}{2})+i\cdot sin(\frac{3\pi}{2}))
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  3. #3
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    sorry

    it was
    a) 9

    wats the argument for 9. thanks for the guide.
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  4. #4
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    Quote Originally Posted by anderson View Post
    sorry

    it was
    a) 9

    wats the argument for 9. thanks for the guide.
    If it's 9 and not -9, then the argument is 0.
    9 = 9 + 0i = 9(cos 0 + i sin 0)


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