- #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?