Cosine is dancing

Geometry Level pending

\[\cos \dfrac{2\pi}{2013} + \cos \dfrac{4\pi}{2013} + \cos \dfrac{6\pi}{2013} +...+ \cos \dfrac{2010\pi}{2013} + \cos \dfrac{2012\pi}{2013} = \ ?\]

×

Problem Loading...

Note Loading...

Set Loading...