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I literally just emailed someone about precisely this thing. You should try the Sage cell server.

Example of Mean Value Theorem (not very pretty formatting but it was what I was just working on)

Now, one does need a web-enabled device for this. So there is that. But note that (as far as I understand it) the CDF player basically is Mma except without being allowed to do anything with it other than play CDF files, so it's perhaps not quite as light-weight as one might think.