Paper 2 · Trigonometry
⏱ Tested in 2 exam questions since 2023
Lesson 12 of 13
Trigonometry 4.11 – Trig Proof 7
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- Prove sin(A + B) = sin A cos B + cos A sin B via the complementary-angle bridge
- Convert sin(A + B) to cos[(90° − A) − B] using sin A = cos(90° − A)
- Apply the cos(A − B) formula, then convert back with the complementary identities
Most recent exam questions
- 2023 P2 Q2(a)
- 2023 P2 Q4(a)(i) — deferred
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