IP AMaths Notes (Upper Sec, Year 3-4): 13) Trigonometry II

Download printable cheat-sheet (CC-BY 4.0)

08 Nov 2025, 00:00 Z

Reviewed by

Marcus Pang·Managing Director (Maths)

Join our Telegram study group

Want small-group support? Browse our IP Maths Tuition hub.

Q: What does IP AMaths Notes (Upper Sec, Year 3-4): 13) Trigonometry II cover?
A: Trig equations, compound angles, and auxiliary angle method for IP AMaths.

With radian fluency in hand, solve trig equations by mapping solutions across quadrants and applying compound-angle identities.

Keep the full topic roadmap handy via our IP Maths tuition hub so you can jump into related drills, quizzes, or diagnostics as you move through these notes.

This topic stays within the SEAB GCE O-Level Additional Mathematics (4049) scope: compound-angle identities, auxiliary-angle rewriting, and solving trigonometric equations in radians.

Status: SEAB O-Level Additional Mathematics 4049 syllabus (exams from 2025) checked 2025-11-30 - scope unchanged; remains the reference for this note.

Identities to deploy

Compound: $\sin(A \pm B) = \sin A \cos B \pm \cos A \sin B$

IP AMaths Notes (Upper Sec, Year 3-4): 13) Trigonometry II

Identities to deploy

Worked example 1 - Solve trig equation

Worked example 2 - Auxiliary angle

Worked example 3 - Using double-angle identities in equations

Practice Quiz

Try this

Related Posts