a formula for the "circumference" of an ellipse.
21:05
Why is there no equation for the perimeter of an ellipse‽
31:10
the geometry of the third derivative
37:03
the equation Ramanujan couldn't solve!!
14:47
An Exact Formula for the Primes: Willans' Formula
15:43
what function satisfies these conditions??
12:52
Why slicing a cone gives an ellipse (beautiful proof)
19:57
the most outlandish technique is used to solve this...
32:32