Product-to-Sum and Sum-to-Product Trig Identities

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5 Terms

1
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(Product-to-Sum Identities)

cosαcosβ

(Product-to-Sum Identities)

½[cos(α + β) + cos(α - β)]

2
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(Product-to-Sum Identities)

cosαsinβ

(Product-to-Sum Identities)

½[sin(α + β) - sin(α - β)]

3
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(Product-to-Sum Identities)

sinαcosβ

(Product-to-Sum Identities)

½[sin(α + β) + sin(α - β)]

4
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(Product-to-Sum Identities)

sinαsinβ

(Product-to-Sum Identities)

½[cos(α - β) - cos(α + β)]

5
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(Sum-to-Product Identities)

cosα + cosβ

(Sum-to-Product Identities)

2cos[(α+β)/2]cos[(α-β)/2]