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These are the Transum resources related to the statement: "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;

understand and use expressions for a cosθ + b sinθ in the equivalent forms of r cos (θ ± α) or r sin (θ ± α)"

Here is an exam-style questions on this statement:

Click on a topic below for suggested lesson starters, resources and activities from Transum.