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Cartesian , Polar and Exponential Form . Help needed thanks .

  1. Sep 28, 2009 #1
    Express -2(cos pai/4+i sin pai/4 ) in Cartesian , Polar and Exponential form ?

    how can i convert this : - 2 (cos pai / 4 + i sin pai / 4 ) to Cartesian , Polar and Exponential form ?

    Thank you very much
     
  2. jcsd
  3. Sep 28, 2009 #2

    lanedance

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    hi mikecrush - any ideas on how to try & solve it?

    worth starting by having a look at the definition/properties of complex exponentials
     
  4. Sep 28, 2009 #3
    So the number is [itex]-2(\cos \pi/4 + i \sin \pi/4)[/itex].

    Do you know what the definitions of Cartesian, Polar, and Exponential forms are?

    You may need the following equations:

    [tex]\begin{array}{c}x=r\cos \theta \\
    y=r \sin \theta \\
    x^2 + y^2 = r^2 \\
    \tan \theta = \frac{y}{x}\\
    e^{i \theta} = \cos \theta + i \sin \theta
    \end{array}[/tex]​

    --Elucidus
     
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