plumiTrig proofs: WJEC A‑Level Maths questions
WJEC A-Level Maths past-paper questions on 5.10 Trig proofs, 2018–2025, with mark schemes and examiner’s reports where available. Add MadAsMaths questions to your practice, or browse them separately by topic and difficulty.
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All 2 questions on Trig proofs, as a list
- Summer 2022, Unit 3, Q17 (5 marks): 7 a) Prove that ( ). ( ) + sin α + β ( ) ≡ cosα + sinα ( ) cosβ + sinβ cos α −β [2] cos3θ + sin5θ cosθ + sinθ b) i) Hence show that can be expressed as . cos4θ
- Summer 2018, AS Unit 1, Q7 (3 marks): Prove that 0 7 sin3θ + sinθ cos2θ ≡ tanθ [3] . cosθ
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