Nah, its an image and thus you need to still do image recognition, but more than just recognizing letters, you need to be able to recognize maths. :p That's evil.
I would think d/dx would have a higher priority. If |x=2pi was then you're d/dx a constant which would make the answer 0.
First you have to do the derivative; then you will solve the derivate at the interval given; in this case it is just x=2pi
Heh, I could canlculate that thing! Damn I'm proud of myself! If I would have the energy to do it thought..
I'd love to see a captcha that worked out who is a computer by providing an equation that can only be solved numerically! Anyone for Navier Stokes?
It's Navier Stokes in spherical or cylindrical coordinates. I don't want to touch that with 50m stick.