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Math Help - complex number polar form

  1. #1
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    complex number polar form

    convert the complex number -8+5i into the form re^itheta
    does it mean the same as polar form so i will get
    9.4<2.59
    so 9.4cos 2.59 +9.4 sin 2.59 =-8+5i
    or is it asking for something else any help would be very greatful
    also i have a couple of these and also dont understand
    evaluate;
    3e^2i
    e^iPi
    and a couple more with basically the same things but dont know what to do thank you for any help cheers
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  2. #2
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    r = \sqrt {64 + 25} \;\& \,\theta  = \arctan \left( {\frac{5}<br />
{{ - 8}}} \right) + \pi
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