Cosine of Integer Multiple of Argument/Formulation 7/Examples

Examples of Use of Cosine of Integer Multiple of Argument/Formulation 7

Cosine of Quintuple Angle

$\cos 5 \theta = \cos \theta - 2 \sin \theta \paren {\sin 4 \theta + \sin 2 \theta}$

Cosine of Sextuple Angle

$\map \cos {6 \theta } = 1 - 2 \sin \theta \paren {\sin 5 \theta + \sin 3 \theta + \sin \theta}$