Mathematics A-Level
power reduction identities
What power reduction identities means in Mathematics A-Level, as defined for WJEC.
Definition of power reduction identities
Check what you remember
Read the wording for your board, then hide it and explain power reduction identities in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: WJEC
Rearranged cosine double angle formulas, cos²A = ½(1 + cos 2A) and sin²A = ½(1 − cos 2A), essential for integrating even powers of sine and cosine.
Topics that use power reduction identities
- Trigonometry (A2 Unit 3: Pure Mathematics B) (WJEC A-Level)
Related terms
- composite trigonometric arguments
- domain and range
- double angle formulas
- exact trigonometric values
- harmonic form
- inverse trigonometric functions
- mixed angle equations
- quadratic approximations
Using power reduction identities in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Mathematics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Mathematics A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge