Math As Useful Beauty [Science Tattoos]

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Nicole, a physics graduate student and blogger, writes:

My tattoo is the Taylor expansion of sine.  I consider it the most beautiful thing I have ever learned (it has held that title for about 7 years) and I got the tattoo after my freshman year at MIT.  It has additional meaning to me since sin(x)~x is one of the most useful things in physics.

For a lesson in Taylor series, go here.