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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 are some exam-style questions on this statement:

- "
*(a) Show that:*" ... more - "
*(a) Show that the equation \( 2 \sin^2 x - 5 \cos x = -1\) may be written in the form \( 2 \cos^2 x + 5 \cos x = 3\)*" ... more - "
*The cosine of acute angle \( \alpha \) is \( \frac{1}{ \sqrt 5} \)*" ... more

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

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