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Thread: using the composite rule???

  1. May 31st 2009, 01:17 AM #1
    jordan1
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    using the composite rule???

    use the composite rule to differentiate the function
    f(x)=e^(cosx+sinx)

    please can you help???
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  2. May 31st 2009, 04:04 AM #2
    Amer
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    you mean chain rule

    e^(u(x)) differentiates to u '(x)*e^(u(x)) so in this case

    f(x)= e^(cosx+sinx)
    f`(x)=(-sinx+cosx)e^(cosx+sinx)
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