25:23

these numbers are "best friends"

13:16

"tuning" a recursive sequence

08:33

e^pi vs pi^e using physics!?!

14:57

an absurd approach to a simple mathematics problem

19:48

Generalizing a test from high-school.

10:58

an awesome approach to otherwise mundane limits

20:11

1886 Cambridge University Exam Integral

12:47

using the "limit definition" of the integral

16:47

when a quadratic equation has an infinite root.

20:05

a geometric approach to a famous integral

10:50

a super nice integral

15:53

Perfect numbers and Mersenne primes

18:23

what a difficult limit!!

22:51

I can solve any quintic equation!!

18:09

a bit about one of Ramanujan's favorite functions

10:29

what's the limit of this integral?

09:29

a very tricky simple problem

16:56

the most creative definition of sine and cosine

16:02

Mobius' favorite function

22:39

Have you ever seen this definition of Euler's constant??

15:26

The most creative digit sum problem I have ever seen!!

16:57

Dini's magical integral

16:22

the unluckiest divisibility rules

26:00

the most viral "false" equation

17:41

the Fibonacci sequence is a trig function??

11:23

my new favorite proof of this classic result

13:36

a classic integral without the standard tool -- antiderivative of ln x without integration by parts

18:49

The series test your Calculus professor hid from you.

32:21

Defense against the "dark art" of mathematics.

23:14

From the IMO shortlist.

12:53

Your new favorite pi approximation.

18:47

a nice floor problem from the IMO long list.

23:45

the quantum integral

13:30

I love the technique for evaluating this limit.

15:21

everyone loves a nice recursive sequence!

16:10

an interesting sequence of integrals

17:36

the subtleties of sequences of functions

45:08

why there is no four dimensional cross product.

11:56

an exceedingly interesting differential equation

11:25

a nice functional equation

11:41

the geometric mean of a function

10:21

a geometry problem inspired by Japanese Sangaku

22:41

the cryptography attack that could bring down the internet.

20:34

which method do you prefer??

14:57

the hyperbolic Fibonacci numbers

13:40

The derivative of sin(x degrees) -- or why we use radians

16:02

A Putnam second derivative problem.

19:03

have you seen this approach to means??

19:00

is this my new favorite number??

16:46

you've been lied to about parabolas

14:18

a nice integer polynomial equation

15:11

reciprocals of twin primes

23:03

the parabolic trig functions

23:13

integer points on Mordell curves

13:41

a famous geometry problem

20:04

a surprisingly complicated sum from a viewer

08:59

Canada's favorite polynomials

21:26

a very interesting differential equation

19:37

Pade Approximation -- unfortunately missed in most Caclulus courses

22:51

Cosine of 1 degree from the ground up.