o An old math joke.

o Two male mathematicians (A & B) are in a bar. A claims that the average person knows very little about basic mathematics. B disagrees, saying that an average person can cope with a reasonable amount of math.

While A goes off to the restroom, B calls over the waitress. He tells her that in a couple of minutes, after his friend has returned, he will call her over and ask her a question. All she has to do is answer "**one third** **x cubed**" and she will be tipped generously.

She repeats "one ser -- dex cue"?

He corrects "one third x cubed".

She: "one thir dex cubed'?

"-Yes, that's right", he says. So she agrees, and goes off mumbling to herself, "one thir dex cubed", "one thir dex cubed...", …

A returns and B proposes a bet to prove his point, that most people do know something about basic math. He will illustrate it by asking the blonde waitress to evaluate an integral, and A accepts the 100$ bet.

B calls over the waitress (in cahoots with him) and asks "Excuse me, what is the integral of x squared?".

The waitress says "one third x cubed," and while walking away, turns back and says over her shoulder **loud and clear** "plus a **constant!"**

Is d/dx (∫ f(x) dx) equal to ∫ d/dx (f(x)) dx

**solution: no! **

** ∫ d/dx (f(x)) dx=d/dx (∫ f(x) dx) +const**

*Edited on ***October 24, 2012, 11:05 am**