Trigonometric Equations | 40 Worked Examples | Edexcel A-Level Maths

40 progressive Edexcel A-Level (9MA0) questions on solving trigonometric equations, with full mark-scheme style worked solutions.

What’s inside:
Easy: solving sin, cos and tan equations in a given interval, in both degrees and radians, including exact answers and negative values.
Medium: multiple-angle equations (sin 2x, tan 2x), shifted-angle equations such as cos(x + 30), quadratic-in-sin-or-cos equations, and equations needing a Pythagorean identity first.
Hard: a sin x + b cos x = c solved via the R form, equations needing a double-angle identity, and harder synoptic problems giving exact answers where possible or to a stated accuracy otherwise.

Every solution shows every step, with M1 (method), A1 (accuracy) and B1 (independent) marks annotated at exactly the point each would be awarded, plus a plain-English note on every working line. Special attention to the classic traps: widening the interval for a transformed angle, never dividing away a factor, and rejecting impossible roots. Typeset in LaTeX for clean mathematical notation.

Ideal for: Year 13 students sitting Edexcel A-Level Mathematics (9MA0) Paper 1 / Paper 2 Pure, plus tutors and teachers building targeted practice. Print-friendly, hand straight to students.