Note: Unlike the rest of the site, these math papers are licensed under CC BY-SA

Here are some papers documenting derivations for things I've found online. In other words, I didn't come up with the original idea for these:

Converting $ax^3+bx^2+cx+d$ to $t^3+pt+q$

Cubic Formula Part 1

Cubic Formula Part 2

Here are some things I've derived myself (but which many other people have probably derived before):

Show that $\sum\limits_{i=2}^n \acoth i = \f{1}{2} \ln \f{n(n+1)}{2}$

Denesting $\sqrt{x\pm\sqrt{y}}$

Find Other $\scbrt{a}$ from Known $\scbrt{a}$

Square Root of Any Complex Number

What are the odds?