Presentation with examples on how to solve trigonometric equations using the CAST diagram. I know not all maths teachers are particularly big fans of using CAST diagrams, but I've found it helpful for ...

A fully animated lesson on solving trigonometric equations in radians using graphs. This was taught for an AS group sitting the AQA spec, which the textbook exercises relate to. Starter focuses on ...

Most problems in trigonometry involve finding the length of an unknown side of a triangle when given one angle and one side or finding an unknown angle in a triangle when the lengths of two sides are ...

Solve \(\sqrt 3 \cos x + \sin x = \sqrt 2\), for \(0 \le x \le 2\pi\). First of all we need to put \(\sqrt 3 \cos x + \sin x\) into the form \(k\cos (x - \alpha ...