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12

02:21

A. Einstein x 3D Tattoo - Green Ink Tattoo Studio

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

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07:10

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