Cosine minus Cosine/Examples
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Examples of Use of Cosine minus Cosine
$\cos 20 \degrees$ minus $\cos 50 \degrees$
- $\cos 20 \degrees - \cos 50 \degrees = 2 \sin 50 \degrees \cos 10 \degrees$
$\cos 2 A$ minus $\cos 4 A$
- $\cos 2 A - \cos 4 A = 2 \sin 3 A \sin A$