Concept — Formule di addizione.
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29·30
Linked atoms
9 linked atoms.
29 Formule di addizione, duplicazione, bisezione
- Example: cosine of 75°
- How the other formulae are derived
- Proof of the cosine subtraction formula
- Sine of 105° and cosine of 165°
- The addition and subtraction formulae
- The duplication formulae
- Triple-angle formula for the cosine