A-Level Maths Edexcel (9MA0)

Understand and use double angle formulae; use of formulae for $\sin{(A ± B)}$, $\cos{(A ± B)}$, and $\tan{(A ± B)}$, understand geometrical proofs of these formulae.

To include application to half angles.
Knowledge of the $\tan{(\frac{1}{2}θ)}$ formulae will not be required.

Understand and use expressions for $a\cos{θ} + b\sin{θ}$ in the equivalent forms of $r\cos{(θ±α)}$ or $r\sin{(θ±α)}$

Students should be able to solve equations such as $a\cos{θ} + b\sin{θ} = c$ in a given interval.