When I enter cos(45) into a calculator, what calculations are being made?
And don't say 1/sec(x) or equivalent trig. identities.
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Edited by HurtfulTurkey: 10/16/2013 6:13:00 PMPut simply, you cannot calculate it by hand. A calculator does it through a very complicated iterative process. You can estimate with a series (Taylor or Maclaurin), but those are approximations.