Double-Angle Formulas
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The double-angle formulas are a set of formulas that express trigonometric functions of twice an angle in terms of the trigonometric functions of the original angle.
Double-angle formulas is a high school-level concept that would be first encountered in a trigonometry course. It is listed in the California State Standards for Trigonometry.
Prerequisites
| Trigonometric Addition Formulas: | The trigonometric addition formulas are a set of formulas that express trigonometric functions of sums of angles in terms of the trigonometric functions of the original angles. |