Introduction
A free trigonometric formulae worksheet for A-Level and International A-Level Maths, covering the trigonometric formulae content of Pure Mathematics 3. It works through the addition formulae, the double-angle formulae, solving equations with them, and writing a cos θ + b sin θ in the form R cos(θ ± α). Each worksheet opens with worked examples and matching Your turn questions, then moves through fluency, reasoning, problem solving and exam-style practice, with Core and Stretch questions in every section, so you build the technique first and then apply it to the kind of unfamiliar, multi-step questions that separate grades in the exam. Written to match the style and presentation of Edexcel International A-Level and 9MA0. Full step-by-step solutions are provided in a separate PDF, so you can check your method as well as your answer.
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