Paper 2 · Trigonometry
⏱ Tested in 5+ recent exam questions
Lesson 5 of 9
Trigonometry 2.5 – Coefficient in front of the angle
This tutorial is for members
Read the lesson notes free below — subscribe to watch the full worked video and download the PDF.
Subscribe for full access · €199/yrYou’ll learn
- Solve sin 2A = k or cos 3A = k by scaling the domain by the coefficient first
- Solve for the whole angle (2A, 3A) and divide by the coefficient only at the last line
- Handle fractions like A/3 in reverse: divide the domain by 3, multiply answers by 3
- Check the count — trig(nA) = k has 2n solutions in 0° ≤ A ≤ 360°
Most recent exam questions
- 2025 P2 Q4(c) — deferred
- 2024 P2 Q3(b)
- 2022 P1 Q8(e)
- 2021 P2 Q9(b)(iv)
- 2020 P2 Q4(a)
💬 Stuck on something in this lesson?
Send your question with this lesson’s name attached — you’ll get a reply by email.