Find the argument

  • #1
utkarshakash
Gold Member
855
13

Homework Statement


[itex]arg \left\{ sin \frac{8∏}{5} + i \left( 1 + cos\frac{8∏}{5}\right) \right\}[/itex]


Homework Equations




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?
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
Homework Helper
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964
Do you know what "argument" means in this problem?
 

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