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Math Help - Using substitution rule

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    Using substitution rule

    How would I use substitution to prove one element is the derivative of another for this problem: ʃ12(x^3+x)^4 (3x^2+1)dx
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    Quote Originally Posted by whboutbob1223 View Post
    How would I use substitution to prove one element is the derivative of another for this problem: ʃ12(x^3+x)^4 (3x^2+1)dx
    u = x^3+x

    du = 3x^2+1 \, dx
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