Best captcha form ever
This one is a really cool captcha validation that I came across in a blog. The site was probably meant for some maths wizards I guess and they wanted to auto disqualify people who didn’t have enough level of maths understanding.
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April 3rd, 2009 at 2:28 pm
answer for this is ln(2). he he
April 3rd, 2009 at 2:37 pm
Explanation:
atan(x) * sin(1/x) goes to zero as x goes to zero. This is because the sine is bounded by 1 in absolute value, and atan(0)=0. Therefore, the answer is ln(2) by continuity of the square root function.
The fact that sin(1/x) does not possess a limit as x approaches 0 is immaterial to this question; it is not necessary to apply the L’Hopital rule.
This was one more cool explanation that i found in this digg url
http://digg.com/odd_stuff/Best_Captcha_Ever_PICTURE