where f'(x) = gradient (or slope) of f(x) at x = x.
Prove that: d/dx(x^2) = 2x
without using calculus.
Except that your definition is also couched in calculus terms (i.e., "gradient").
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re(4): Err....
