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Home : Math & Science : Math Study Guides : Trigonometry : More Trigonometric Identities : Sums and Differences of Functions
Sums and Differences of Functions
The following formulas relate the sum of trigonometric functions of different
angles to products of multiple angle functions. These
identities are also useful for
simplifying expressions.
sin(α) + sin(β) = 2 sin      |
| cos(α) + cos(β) = 2 cos |
| sin(α) - sin(β) = 2 cos |
| cos(α) - cos(β) = - 2 sin |
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