title: Range reduction for trigonometric functions
body: <p>I'm trying to implement range reduction for trigonometric functions.
  I found this paper <a href="http://www.computer.org/csdl/proceedings/pcspa/2010/4180/00/4180b048-abs.html" rel="nofollow">http://www.computer.org/csdl/proceedings/pcspa/2010/4180/00/4180b048-abs.html</a> which talks about using 64-bit integer arithmetic.</p>
  
  <p>The idea presented should work but there seems to be some problem with equations in the paper.
  Is this efficient than the one implemented in fdlibm ?</p>