7.4: Double-Angle, Half-Angle, and Reduction Formulas
https://math.libretexts.org/Bookshelves/Precalculus/Precalculus_2e_(OpenStax)/07%3A_Trigonometric_Identities_and_Equations/7.04%3A_Double-Angle_Half-Angle_and_Reduction_Formulas
WebPrecalculus & Trigonometry. Precalculus 2e (OpenStax) 7: Trigonometric Identities and Equations. Expand/collapse global location. 7.4: Double-Angle, Half-Angle, and Reduction Formulas. Page ID. OpenStax. Learning Objectives. In this section, you will:
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