You can download the document that will teach you how to derive the formula for finding areas underneath curves below:

Alternatively, you can watch this video:

You can download the document that will teach you how to derive the formula for finding areas underneath curves below:

Alternatively, you can watch this video:

You can now find out how to derive the 3 main **cosine rule** formulas through a new document that I’ve created called “**Cosine Rule Mastery**“.

This document can be downloaded free of charge along with “Sine Rule Mastery” which is another document that explains in detail how to come up with the sine rule formula.

If you’re interested in downloading one or both of these documents, please visit this link: **http://mathsvideos.net/free-resources-downloads/**.

I’d also like to talk about a new video I’ve created (posted below). It’s related to a 4 dimensional hypercube and learning how to train your mind to see things from different mathematical perspectives.

Prior to posting up the video above, I did create another similar video. In the video below, you will see me split a prism into 3 equal parts. This video will interest those who’d like to find the volume of a square based pyramid.

Learn why sin(A+B)=sinAcosB+cosAsinB with this elegant proof…

**Like this proof? Why not check out this page…**

How to prove that sin(A-B)=sin(A)cos(B)-cos(A)sin(B) geometrically

Learn how to come up with Pythagoras’ famous formula – from absolute scratch…

To see the full explanation in writing, please visit the link below:

Find out how to come up with the Trapezium Rule formula from scratch.

1) Derive the formula for the area of trapeziums:

2) Use the area of trapeziums formula to come up with the Trapezium Rule formula:

**Related:**

Learn how to come up with the formula for areas of triangles, then use this formula to derive the sine rule formula.

**Related:**