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Use the definition of derivative to find the derivative of tan(x)

  1. Oct 24, 2010 #1
    1. The problem statement, all variables and given/known data
    use the definition of derivative to find the derivative of tan(x)


    2. Relevant equations

    Tan(x)= sinx/cosx

    3. The attempt at a solution

    i used sinx/cosx, and then use quotient rule, not sure if it is call "definition of derivative"so, is there anyway i can use f(x+h)-f(x)/h to find the derivative of tan (x)?
     
  2. jcsd
  3. Oct 24, 2010 #2

    sylas

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    Science Advisor

    The question does want you to use (f(x+h)-f(x))/h, which is the definition of the derivative. That's the relevant equation. It might also be handy to have an equation for tan(a+b).

    Cheers -- sylas
     
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