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Trigonometric integrals

  1. Feb 3, 2012 #1
    1. The problem statement, all variables and given/known data

    Screenshot2012-02-03at51057AM.png

    Screenshot2012-02-03at51050AM.png


    I understand everything except why the derivative of 2 + tan (x/2) is .5 + sec^2(x/2)
    I don't understand the .5 part. I understand the sec part. I would think the derivative of 2 would be C, or just disappear.
     
  2. jcsd
  3. Feb 3, 2012 #2
    never mind. I got it. i've got to use the chain rule. the derivative of t/2 is 1/2
     
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