Writing a number in trigonometric form - Math Help Forum

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#1

$Old$ November 3rd, 2009, 06:59 PM

Sugar Sana $Sugar Sana is offline$

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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

$Old$ November 3rd, 2009, 07:59 PM

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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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trigonometric form

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