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Homework Help: Difference between arctan(x) and cot(x)

  1. Jul 20, 2009 #1
    If arctan(x) = tan(x)^-1 and since tan(x) = sin(x)/cos(x) is not arctan(x) = cot(x). I know something's not right here but what is it?

  2. jcsd
  3. Jul 20, 2009 #2


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    No no.

    arctan(x)=tan-1(x) [itex]\neq[/itex]1/tan(x)
  4. Jul 21, 2009 #3
    Just to clarify, that notation doesn't mean the multiplicative inverse in this context, but the inverse function.

    With whatever restrictions are necessary so that those are functions and not just relations.
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