natural log of -2
9:52
logarithm with negative base and negative input
16:28
A very interesting differential equation.
5:24
How Do You Actually Compute Logarithms?
12:02
What is e and ln(x)? (Euler's Number and The Natural Logarithm)
21:35
2^(a+bi), ln(a+bi), and sin(a+bi)
5:50:23
100 integrals (world record?)
6:38
Area of the incircle of a triangle (shortcut & proof)
19:44