How can I prove this equation:
it is attached in a photo.
Which equation? There are at least three, and some use the same variables.
the equation which is circled
It seems that the easiest way these days is to post it to Wikipedia and then cite it as a source...
I didn't find it on wikipedia
Sorry, that was a joke (as is almost everything that I post). What I meant was that if you just want to prove it, you post it on Wikipedia and then cite yourself as the expert for proof. Ah, never mind... I'm just just babbling now...
Separate names with a comma.