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If F(x) = the integral from 1 to ln x of √cos t dt, then F' (x) =?

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  • cidyah
    Lv 7
    6 years ago

    Let g(t) = √cos t

    Let h(x) = x (upper limit of integration)

    h'(x) = 1

    F'(x) = g ( f(x) ) f'(x)

    F'(x) = √cos x (1)

    = √cos x

  • 6 years ago

    Teacher says the answer is( √cos(ln x))/x but we cannot get that answer. Could the teacher's answer be wrong?

  • 6 years ago

    If F(x) = the integral from a to g(x) of f(t) dt, then F'(x) = f(g(x)) * g'(x)

    That's the Fundamental Theorem of Calculus. Replace with your functions.

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