On the other hand, google doesn't appear to take the extreme copyright stance that Wolfram Alpha does.

Read their TOS: http://www.wolframalpha.com/termsofuse.html, specifically their Attribution and Licensing section.

If you incorporate results from Wolfram Alpha in any work without attribution meeting their standards you will have breached your TOS and they suggest you also will have committed copyright violations and academic plagiarism. If your work is not personal (unshared?) or academic, then they demand you negotiate a license.

Google seems happy to let you know sin(x) is wiggly and send you on your way.