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Homework Help: Find the argument

  1. Oct 7, 2012 #1


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    Gold Member

    1. The problem statement, all variables and given/known data
    [itex]arg \left\{ sin \frac{8∏}{5} + i \left( 1 + cos\frac{8∏}{5}\right) \right\}[/itex]

    2. Relevant equations

    3. The attempt at a solution
    [itex]2sin \frac{4∏}{5} cos \frac{4∏}{5} + i2cos^{2} \frac{4∏}{5} \left(cos2θ=2cos^{2}θ-1 and sin2θ=2sinθcosθ\right)[/itex]

    After simplification what is the next step?
  2. jcsd
  3. Oct 9, 2012 #2


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    Science Advisor

    Do you know what "argument" means in this problem?
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