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I thought it had to be static, but no: the captcha actually changes at each page reload.

At least it will weed out the non-mathematicians easily...



Hardly. You can just type it into WolframAlpha, that works perfectly. (Which is quite funny because you are letting the computer solve something that’s supposed to keep computers out.)

You don’t even need to learn any fancy syntax, “derivative of” works great. (High school math homework would be so much easier with WolframAlpha.)




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