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I'm doing trigonemetric substitutions

  1. Aug 21, 2008 #1
    if x=a sec theta would that mean that theta= sec^-1 x
     
  2. jcsd
  3. Aug 21, 2008 #2

    Defennder

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    You omitted the 'a'. It's better to re-write this in terms of cos instead, in the form arc cos(...) = theta.
     
  4. Aug 21, 2008 #3
    how do rewrite it in terms of cos, would it be 1/cos
     
  5. Aug 21, 2008 #4

    Defennder

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  6. Aug 21, 2008 #5
    oh ok
     
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