calculus

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please help!
Find the derivative of f when
f(x) = 5 tan^-1 (e^-x) + 6e^x

  • calculus -

    f'= 5 (1/(1+e^-x) * (-e^-x) + 6e^x
    = -5/(e^x+1) + 6e^x

    check that.

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