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What's wrong with this solution of tan^3x?

  1. Mar 1, 2008 #1
    I don't see what I am doing wrong in this. The answer I got is obviously not right. Appreciate any help. Thanks!
     

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  2. jcsd
  3. Mar 1, 2008 #2

    nicksauce

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    Why is the answer you got obviously not right? I would say it is right.
     
  4. Mar 1, 2008 #3
    Cause the answer is suppose to be 1/2(tanx)^2 -ln(secx)
     
  5. Mar 1, 2008 #4

    nicksauce

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    so tanx^2 = secx^2 -1, and the -1 gets absorbed into the constant of integration.
     
  6. Mar 1, 2008 #5
    Oh, yeah that would make sense. Is quite odd how two different things are exactly the same when you integrate them. Thanks.
     
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