This formula, minus the differentiation part = -4*cos(7x).
The differentiation of the cosinus to x is 28*sin(7x), fill in x=0, and the answer is 0.
If it’s really to detect humans “who the hell knows” “no idea” and “nobody told me there was going to be a quiz” should work just fine.
Now if it’s to detect math folks, just the one answer. That wasn’t the asserted proof being tested though.
I spaced out during advanced mathematics class.
it is indeed 0 …
yeah i got zero as well. just using the chain rule,
28cos(7x-pi/2) evaluated at zero.
cos(-pi/2) is = 0
Hehe I posted this one a while ago, along with some other very bad captchas.
Just so you know, here’s the URL that uses that one: http://random.irb.hr/signup.php
In fact, the math problem is very simple, and this captcha really applies, because it’s for a “quantum random bit generation” service, so only people with math experience will want to use it anyway.
the answer is 0.
This formula, minus the differentiation part = -4*cos(7x).
The differentiation of the cosinus to x is 28*sin(7x), fill in x=0, and the answer is 0.
If it’s really to detect humans “who the hell knows” “no idea” and “nobody told me there was going to be a quiz” should work just fine.
Now if it’s to detect math folks, just the one answer. That wasn’t the asserted proof being tested though.
I spaced out during advanced mathematics class.
it is indeed 0 …
yeah i got zero as well. just using the chain rule,
28cos(7x-pi/2) evaluated at zero.
cos(-pi/2) is = 0
Hehe I posted this one a while ago, along with some other very bad captchas.
Just so you know, here’s the URL that uses that one: http://random.irb.hr/signup.php
In fact, the math problem is very simple, and this captcha really applies, because it’s for a “quantum random bit generation” service, so only people with math experience will want to use it anyway.