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Math Help - using fundamental theorem of calculus 1

  1. #1
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    using fundamental theorem of calculus 1

    let f(x) = integral from 1 to x of e^(-t) dt
    find f'(x)


    the answer i got was
    f'(x) = e^(-x)
    is this correct?
    if not what is the correct answer?
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  2. #2
    o_O
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