Cosine of 1 degree from the ground up.
23:03
the parabolic trig functions
21:26
a very interesting differential equation
26:38
The Wallis product for pi, proved geometrically
23:39
from an integral to a differential equation
32:32
Why don't they teach simple visual logarithms (and hyperbolic trig)?
27:40
The Biggest Misconception in Physics
19:37
Pade Approximation -- unfortunately missed in most Caclulus courses
19:26