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Math Help - Differentiating an integral

  1. #1
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    Differentiating an integral

    d/dx( ∫ 3x to x^3 (t^3 + 1)^10 dt )

    I am not sure how to do this, except I know that you are suppose to use chain rule
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  2. #2
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    h(x)=\int_{f(x)}^{g(x)}{\delta (t)\,dt}\implies h'(x)=\delta \left( g(x) \right)g'(x)-\delta \left( f(x) \right)f'(x).
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  3. #3
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    Makes sense, except I got to the part:


    d/du( ∫ v to u (t^3 + 1)^10 dt )du/dx

    but this doesnt make sense since my lower limit (v = 3x), isnt in terms of u
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  4. #4
    Super Member Random Variable's Avatar
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     \frac{d}{dx} \int^{x^{3}}_{3x} (t^{3}+1)^{10} \ dt = \frac{d}{dx} \Big( F(x^{3}) - F(3x) \Big) where F is an antiderivative of  (t^3+1)^{10}

     = F'(x^{3}) \ \frac{d}{dx} (x^{3}) - F'(3x) \ \frac{d}{dx} (3x) = \Big((x^{3})^3+1\Big)^{10} * 3x^{2} - \Big((3x)^{3}+1\Big)^{10} *3

     = 3x^{2} (x^9+1)^{10} - 3(27x^{3}+1)^{10}
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  5. #5
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    Thanks a lot. How would you do it in a form like this: d/du( ∫ v to u (t^3 + 1)^10 dt )du/dx, keeping the integral sign, and subbing in variables for the lower and upper limits?
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