Question

$\cos( \alpha \ + \beta )$
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Answer 1

Step-by-step explanation:

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

Answer 2

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

this is the answer your question