Sine addition formula (sin(A+B) = sinA cosB + cosA sinB)
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sin(A+B) = sinA cosB + cosA sinB
What each symbol means
| Symbol | What it stands for |
|---|---|
| A, B | Angles in radians or degrees; formula holds for all real A, B where both sides defined. |
When to use this
Valid for all real A, B. Each term must be defined (no indeterminate forms from tan if you divide later).