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Surface area of a cone

  1. Feb 5, 2012 #1
    1. The problem statement, all variables and given/known data


    Screenshot2012-02-05at43959AM.png

    I understand everything except for the part where the -1 pops out of nowhere on step 4. why? how?
     
  2. jcsd
  3. Feb 5, 2012 #2

    Mentallic

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    Homework Helper

    Remember that when you solve an integral, you need to take the integral of the highest value minus lowest value. So if you want to solve

    [tex]\int^{b}_{a}f(x)dx[/tex]

    Then you'll have

    [tex]=\left[F(x)\right]^b_a[/tex]

    [tex]=F(b)-F(a)[/tex]
     
  4. Feb 5, 2012 #3

    wukunlin

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    Gold Member

    the 1 is the result of substituting the lower limit of the previous step, ie x = 0, which subtracted from the upper limite of the previous step, x = 1/2

    edit: oops. too late
     
  5. Feb 5, 2012 #4
    thanks, I got it.
     
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