Hey students!!! ‍ ‍
You will learn the derivation of a very important trigonometry formula (identity)
cos(x + y) = cosx cosy sinx siny
in a very easy and simple way with the help of simple animations and colorful explanation. The formula is one of the basic formulas that is used to derive many more trigonometric formulas. So it becomes extremely important for students to understand the underlying concepts as well.

This derivation of this formulas includes 3 important parts (steps):
Finding coordinates of 3 points on Unit Circle making angles x, x+y, y on the centre of the circle
Identifying 2 congruent triangles using these points
Using distance formula to eventually derive the formula.

I hope you will find this video really helpful. Let me know your thoughts on this video tutorial in comment section.

00:00 About the derivation of the formula
01:14 Quick tip
01:50 Finding coordinates using Unit Circle
05:49 Prove triangles are congruent
09:24 Applying Distance Formula

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