double angle formulae
Exam specification: Edexcel > Maths A-level > C3 > Trigonometry
Knowledge and use of double angle formulae; use of formulae for sin (A ± B), cos (A ± B) and tan (A ± B) and of expressions for a cos θ + b sin θ in the equivalent forms of r cos (θ ± a) or r sin (θ ± a).
To include application to half angles. Knowledge of the t (tan θ/2) formulae will not be required.
Students should be able to solve equations such as a cos θ + b sin θ = c in a given interval, and to prove simple identities such as cos x cos 2x + sin x sin 2x ? cos x.
Contents: [tpcdblanglemlst]
Exercises: [tpcdblanglexlst]