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Simplifying after applying quotient rule

  1. Oct 1, 2011 #1
    1. The problem statement, all variables and given/known data

    http://images.calcchat.com/solutionart/etf5e/03/c/se03c01047.png [Broken]

    2. Relevant equations

    3. The attempt at a solution

    What am i missing, because i get: 6/4 [(-1 + tanx*secx- (tanx)^2]
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 1, 2011 #2


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    Homework Helper

    Use that sin^2x+cos^x=1 in the third row .

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