Trigonometry Basics - Proof for Cos(x+y)
Channel: Graph It Out
Date: 21/09/2023

This video discusses the proof that gives an expression for cos(x+y) in terms of cos & sin of x & y. This proof is a very simple one. We follow a step by step, graphical approach in the explanation.

00:00 - Intro
00:44 - Repo & graph
01:26 - Dependencies
03:58 - Objective
05:18 - 1 Angle - Chord length
07:57 - 2 Angles - Chold length
10:09 - Main proof

The explanation is based on a graph which can be found in the following repository: github.com/charstorm/class-11-12-india

Errata:
Nothing so far.