Posted on 10/18/2010 6:08:02 AM PDT by ShadowAce
Don’t you just love Captchas? CAPTCHA is an acronym for “Completely Automated Public Turing Test.” Completely Automated Public Turing test to tell Computers and Humans Apart.” I just call them PITA (pain in the ass). Here are my top 10 worst Captcha’s ever.
From best to worst:
I saw the worst one EVAH yesterday. Didn’t think of doing a screengrab.
Basically, it is saying "Take the derivative of the follow equation with respect to x.
Doesn't that one have a division by zero problem?
No, but the expression does evaluate to zero.
LOL! It’s been almost 20 years since I’ve done derivatives. I couldn’t figure it out off the top of my head.
Oh man. I got 28.
The first symbol is a “partial derivative” of the expression in the brackets, with the expression in the brackets evaluated with x as zero.
If I can kick-start my sleep-deprived brain, I think the final result comes out as:
7*x = 0,
which leaves us with 4 * sin(-pi/2), and doing a quick radian->degree conversion, we have sin(270 degrees) which is -1, so we have 4 * -1 which is -4.
The derivative of any constant is 0, and since -4 qualifies, the sum total of that mess is zero, zed, zip, bupkiss, nil, 0.
Don’t you have to take the derivative before you evaluate?
so you get 4 * 7 * cos (7*x) where x = 0, so you get 28, right?
With the notation on the right of |x=0, I believe you have to start evaluating from the inside to arrive at what you’re taking the derivative of.
Maybe if you get it right, you show you are a computer. If you miss it, you prove you are a human.
No, that’s for integrals.
Those are integrals, but they usually had a notation like “d/dx” on the end of the integral, which meant that you were integrating with respect to the derivative of x, or “d/dt” which means you’re integrating with respect to the derivative of time, etc.
That’s integration - the opposite of derivation.
Thanks for the correction. I guess I am not qualified to be a human on that web site!
That should be the derivative of -28, which is zero.
I just remembered Wolfram released their math “google” page, which allows you to do amazing stuff on the fly.
Here’s the result:
http://www.wolframalpha.com/input/?i=partial+derivative+of+%5B4+*+sin%287*x+-+pi%2F2%29%5D%7Cx%3D0
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