Sum and Difference Identities

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Last updated 5:50 PM on 10/16/26
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6 Terms

1
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cos (A+B)

(cos A)(cos B)-(sin A)(sin B)

2
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sin (A+B) =

(sin A)(cos B) + (cos A)(sin b)

3
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tan (A+B) =

(tan A + tan B) / (1 - tan A tan B)

4
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cos (A-B) =

(cos A)(cos B) + (sin A)(sin B)

5
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sin (A-B) =

(sin A)(cos B)-(cos A)(sin B)

6
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tan (A-B) =

(tan A - tan B) / (1 + tan A tan B)