10:37 The Cosine Rule - GCSE Higher Maths
Clear GCSE Higher walkthrough of the cosine rule for both missing sides and missing angles, with chapters.
The cosine rule
Use the cosine rule to find angles and side lengths in any triangle
4 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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4 shown 10:37 
34:12 The Cosine Rule | Grade 7 Maths Revision | GCSE Maths Tutor
Thorough half-hour revision of cosine rule techniques for sides and angles with plenty of worked examples.
18:11 The Cosine Rule
Maths Genie's full cosine rule tutorial covering both missing sides and missing angles.
5:07 Cosine rule - Corbettmaths
Corbettmaths shows clearly how to find a missing side using the cosine rule.