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Asked by Toni

Show each step to show how to verify the identity.

cos(x + y) + cos(x - y) = 2 cos x cos y
10 years ago

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Answered by Steve
use your sum/difference formulas:

cos(x+y) = cosx cosy - sinx siny

now use the difference formula, and then add them up and see what drops out.
10 years ago
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Show each step to show how to verify the identity.

cos(x + y) + cos(x - y) = 2 cos x cos y

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