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Math Help - Value of Argz

  1. #1
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    Value of Argz

    Hey guys, just another question on complex numbers:
    z = cos36 - isin36, State the values of absolute z and Argz

    Okay, so this is how far i can get:

    z = cos(pie/5) - isin(pie/5)
    z = cos(pie/5) + i(-sin(pie/5))

    From there im not to sure what to do, since the sin value is negative. Please explain working out.
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  2. #2
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    Recall that cosine is an even function and sine is an odd function.
    So \cos \left( {\frac{\pi }{5}} \right) - i\sin \left( {\frac{\pi }{5}} \right) = \cos \left( { - \frac{\pi }{5}} \right) + i\sin \left( { - \frac{\pi }{5}} \right)<br />
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