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  1.  
    I thought I had a response to

    http://mathoverflow.net/questions/8846/proofs-without-words

    Which shows why the derivative of sine is cosine. I looked today and I do not see it.
  2.  

    Here it is: http://mathoverflow.net/questions/8846/proofs-without-words/8932#8932

    It was deleted by a moderator on July 7. I'm not sure why, but I suspect it is because your image host stopped serving the image.

  3.  
    Could it be undeleted so that I could repost the image? Do you have a recommendation for where to host it?
  4.  

    It's undeleted, but indeed the image is b0rked. I'm not really sure what the best choice for image hosting is, though...