Werner Formula for Cosine by Sine/Examples

Examples of Use of Werner Formula for Cosine by Sine

Example: $2 \cos 30 \degrees \sin 20 \degrees$

$2 \cos 30 \degrees \sin 20 \degrees = \sin 50 \degrees - \sin 10 \degrees$

Example: $2 \cos 2 A \sin 4 A$

$2 \cos 2 A \sin 4 A = \sin 6 A + \sin 2 A$