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

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