Intro: PDF
Sec, Cosec, Cot: PDF, Video
Compound angle and double angle: PDF, Video
Compound angle and double angle formula derivation: PDF, Video
Auxiliary angle method: PDF, Video
Proving trigonometric identities: PDF, Video
Solving trigonometric equations: PDF, Video
Topical past paper: PDF, Video, Question only
Resources and references
https://www.desmos.com/calculator
https://www.symbolab.com/
https://www.embibe.com/exams/real-life-applications-of-trigonometry/