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Home > Math Facts > Trigonometry > Trigonometry Triple-angle, Multi-angle and Power Reduction Formulas
Trigonometry Triple-angle, Multi-angle and Power Reduction Formulas
| Triple-angle Identities | Multi-angle Identities | |
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If Tn is the nth Chebyshev polynomial then
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If Sn is the nth spread polynomial, then |
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de Moivre's formula
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The Dirichlet kernel Dn(x) is the function occurring on both sides of the next identity: .
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| Power Reduction Formulas | ||
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