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1

05:48

How to add up EVERY number from 1 to 100, Carl Friedrich Gauss Style (C1 Mathematics)

4

08:23

The Inverse Pythagorean Theorem (Geometrical / Algebraic Proof)

2

14:40

Trig Tricks: How to get cos(π/3, π/4, π/6) and sin(π/3, π/4, π/6) without a calculator

4

07:10

How to derive Pythagoras' theorem using Thales's theorem [full workings]