Ben Alpert
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 Jul22 comment Intuitive understanding of the derivatives of $\sin x$ and $\cos x$ @Justin L.: Whoops, I definitely misread your question and thought that it was answering itself somehow. Sorry! Jul22 comment What property of certain regular polygons allows them to be faces of the Platonic Solids? The definition of "Platonic solid" requires that the faces are identical regular polygons, but apparently you're looking for some other more general definition that allows irregular polygonal faces. Why is it that you're not counting the triangular bipyramid which doesn't have regular faces? Here's a picture: upload.wikimedia.org/wikipedia/en/thumb/f/f7/… Jul21 comment Intuitive understanding of the derivatives of $\sin x$ and $\cos x$ I feel like maybe this should be a question asking if anyone knows of an intuitive explanation and you should write the second part of your answer as an answer. (See meta.stackexchange.com/questions/17463). Jul21 awarded Student Jul21 awarded Editor Jul21 revised Tiling a 3 by 2n rectangle with dominoes added 1 characters in body Jul21 asked Tiling a 3 by 2n rectangle with dominoes Jul21 comment Best Intermediate/Advanced Computer Science book I think this would be more appropriate at Stack Overflow, no? Jul21 comment Card doubling paradox To whoever downvoted this: why? I think it's a perfectly good question and it's pretty obvious that this is math so it's in the scope of the site. Jul20 awarded Supporter Jul20 awarded Nice Answer Jul20 answered Can you recommend a decent online or software calculator? Jul20 awarded Teacher Jul20 awarded Autobiographer Jul20 answered How can you prove that the square root of two is irrational?