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Math Help - Finding the derivatives

  1. #1
    Newbie
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    Dec 2008
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    19

    Finding the derivatives

    this is a calc ab problem
    f(x) = (x+sinx)/(cosx) for -π/2 < x <π/2
    a)State whether this is an even or odd function
    i thought it was odd because i graph it and also f(-x)=-f(x)
    b)find f'(x)
    ((cosx)(1+cosx) - (x+sinx)*(-sinx))/((cosx)^2)
    is there a more simplified way?
    c) Write an equation of the line tangent to the graph of f at the point where x=0
    Would I just subsitute 0 into the derivative formula and then put it into y=mx+b equation?
    thanks in advance
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  2. #2
    Member OnMyWayToBeAMathProffesor's Avatar
    Joined
    Sep 2006
    Posts
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    I agree with your A but why don't you try to simplify B some more and post up what you got?
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