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Establish each identity. $$ \cos (\alpha+\beta)+\cos (\alpha-\beta)=2 \cos \alpha \cos \beta $$...

Question

Establish each identity. $$ \cos (\alpha+\beta)+\cos (\alpha-\beta)=2 \cos \alpha \cos \beta $$

Establish each identity. $$ \cos (\alpha+\beta)+\cos (\alpha-\beta)=2 \cos \alpha \cos \beta $$



Answers

Establish each identity. $$ \cos (\alpha+\beta)+\cos (\alpha-\beta)=2 \cos \alpha \cos \beta $$


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