-=The Visible Dave Project=-

how did u find my site?
you told me about it
friend told me about it
search engine results
typed randomly;found myself here
other
 

this website would be better without ads?!
yes, i'd login and identify myself.
yes, just cause - everything should be free.
no
don't care
 

RIF [Reading is Fun-duh-mental] but TLDR [Too long; didn't read]

$$\cos x = \sum\limits_{n = 0}^\infty {\frac{{\left( { - 1} \right)^n x^{2n} }}{{\left( {2n} \right)!}}}$$