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08-26-2009   #9 (permalink)
SilentSaber
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Another one for calculus, since I don't see it up:
Integral Calculator > Wolfram Mathematica Online Integrator
Derivative Calculator > Step-by-Step Derivatives (Shows steps)...
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Human history is the story of complaisance. While disaster is fresh in our memory, we take precautions. But as the memory of disaster recedes, we start to take risks.