Pythagorean Proof

Here is a simple proof of that right angle formula we all memorize in geometry and algebra!  Best of all, I was able to make this video using my new tablet toy and a free program called TuxPaint.

The Pythagorean Theorem

limit of (1-cosx)/x as x approaches 0 =0

A new video with another limit proof!

We can use the last proof of 

limit of sinx/x as x approaches 0 =1

 to help prove another "famous" proof

 limit of (1-cosx)/x as x approaches 0 = 0

I used my new tablet and an easy to use program called Skitch to create this.

Proof of limit of sinx/x as x approaches 0

Just bought a tablet to try making videos as part of my flipped classroom experiment.  Since I am working on studying for the math CSET III, I though I would try my hand at a well known calculus proof. 

Limit of sinx/x as x approaches zero