ï»¿ Cosine of the difference of two angles formula

# Cosine of the difference of two angles formula

cdta
Trigonometry

Cosine of the difference of two angles is equal to the product of cosine of the two angles plus the product of sine of the two angles.

\cos(\alpha -\beta ) = \cos \alpha\cos \beta +\sin \alpha \sin \beta

or

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