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

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

 * $\cos 5 \theta = \dfrac 1 2 \paren {\paren {2 \cos \theta }^5 - 5 \paren {2 \cos \theta }^3 + 5 \paren {2 \cos \theta } }$

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