A complex way to integrate 1/(x^2+1)

One satisfying factoring problem x^5+x^4+1

You can solve this integral by “magic”

e^pi vs pi^e

Can 0^x=2?

39/1000, series of (1+1/n)^n, calculus 2

42/1000, epsilon-delta proof of a limit, calculus 1

53/1000, sketching the graph of the derivative from the original function, calculus 1

37/1000, telescoping series, calculus 2

31/1000, multivariable limit w/ polar coordinates, calculus 3

40/1000, derivative of ln(x+sqrt(x^2+1)), calculus 1