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Math Help - Writing a number in trigonometric form

  1. #1
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    Question Writing a number in trigonometric form

    I feel dumb asking this, but I cant get the right answer...

    Write in Trigonometric form

    9.6-5.5i
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  2. #2
    Master Of Puppets
    pickslides's Avatar
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    I think you require

    given z = a+bi

    then

    z = \sqrt{a^2+b^2}~\text{cis}\left(\tan^{-1}\left(\frac{b}{a}\right)\right)
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