Trig Double Angle Formulas from Semicircle (visual proof)
0:41
Trapezoid Area Visual Proof
9:56
A Visual Attempt at 1 + 2 + 3 + 4 + 5 + ... = -1/12
20:51
All the TRIG you need for calculus actually explained
20:47
ANGLE THEOREMS - Top 10 Must Know
12:52
Why slicing a cone gives an ellipse (beautiful proof)
18:07
18 year old students just discovered a proof of Pythagoras that mathematicians said was impossible
4:15
Trig Visualized: One Diagram to Rule them All (six trig functions in one diagram)
12:19