# Math Help - Someone aware me on magic differentiation

1. ## Someone aware me on magic differentiation

Like in this thread...

http://www.mathhelpforum.com/math-he...-integral.html

From simplependulums post.

I've seen it used in another thread as well.

What is it?

2. I am not sure what he is doing but since it is a definite integral, why not define an inner product and orthonormal vectors in [0,1]? Then you can avoid the messy integration.

3. Originally Posted by dwsmith
I am not sure what he is doing but since it is a definite integral, why not define an inner product and orthonormal vectors in [0,1]? Then you can avoid the messy integration.