12:01

a+b+c+d+e = abcde

20:37

Integrate x^-x dx

24:56

Integrate 1/(1+x^3)

16:54

An integral with a classic result

13:14

When f(x) = f(a-x)

19:14

The strange cousin of the complex numbers -- the dual numbers.

17:08

n^4 + 3n^2 + 2 is never a perfect square

14:35

Lambert W Function