Morrie's Law

Author

Eric W. Weisstein
November 21, 2008

This notebook downloaded from http://mathworld.wolfram.com/notebooks/Trigonometry/MorriesLaw.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/MorriesLaw.html.

©2008 Wolfram Research, Inc. except for portions noted otherwise

Product

Special

FullSimplify[Times@@(Cos[# Degree]&/@{20,40,80})]

General

(2^k)Product[Cos[(2^j)a],{j,0,k-1}]