Cosine of Integer Multiple of Argument/Formulation 1/Examples/Cosine of Sextuple Angle

Example of Use of Cosine of Integer Multiple of Argument/Formulation 1

 * $\cos 6 \theta = \dfrac 1 2 \paren {\paren {2 \cos \theta }^6 - 6 \paren {2 \cos \theta }^4 + 9 \paren {2 \cos \theta }^2 - 2 }$

Proof
Follows directly from the Cosine of Integer Multiple of Argument/Formulation 1: