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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.

Classroom Articles on Trigonometry (Up to High School Level)

  • Cosine
  • Sine
  • Half-Angle Formulas
  • Tangent
  • Law of Cosines
  • Trigonometry
  • Law of Sines
  • Unit Circle