IP AMaths Notes (Upper Sec, Year 3-4): 12) Trigonometry I

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08 Nov 2025, 00:00 Z

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Marcus Pang·Managing Director (Maths)

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Q: What does IP AMaths Notes (Upper Sec, Year 3-4): 12) Trigonometry I cover?
A: Radian measure, special angles, and core identities for Additional Mathematics trigonometry.

Everything in upper-sec trig is built on radians and the primary identities. Memorise the exact values and practise expressing angles in coterminal forms.

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.

These fundamentals align with the SEAB GCE O-Level Additional Mathematics (4049) trigonometry scope for exams from 2025: radian measure, sector arc/area, Pythagorean and co-function identities, and special-angle values.

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

Key facts

Radian definition: arc length $s = r\theta$ .
Area of sector: $A = \tfrac{1}{2} r^2 \theta$

IP AMaths Notes (Upper Sec, Year 3-4): 12) Trigonometry I

Key facts

Worked example 1 - Arc and sector

Worked example 2 - Identity manipulation

Worked example 3 - Radian conversion in context

Practice Quiz

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