Written by the Fiveable Content Team • Last updated August 2025
Verified for the 2027 exam
Verified for the 2027 exam•Written by the Fiveable Content Team • Last updated August 2025
Definition
Trigonometric identities that express the sine or cosine of twice an angle in terms of trigonometric functions of the original angle, derived from sum identities.
AP course connection
Topic 3.12: 3.12 Equivalent Representations of Trigonometric Functions