Precalculus » E. Analytic Trigonometry » E.5. Multiple-Angle and Product-to-Sum Formulas

Multiple Angle Formulas
Power-Reducing formulas
Half-Angle Formulas
Product-to-Sum Formulas
Sum-to-Product Formulas

Power-Reducing formulas — Rewrite the trigonometric expression as a sum of first powers of cosine

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