Cosine of Integer Multiple of Argument/Formulation 2/Examples/Cosine of Sextuple Angle

Example of Use of Cosine of Integer Multiple of Argument/Formulation 2

 * $\map \cos {6 \theta } = \cos^6 \theta \paren {1 - 15 \tan^2 \theta + 15 \tan^4 \theta - \tan^6 \theta}$

Proof
Follows directly from the Cosine of Integer Multiple of Argument/Formulation 2: