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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Originally Posted by whboutbob1223 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 $\displaystyle u = x^3+x$ $\displaystyle du = 3x^2+1 \, dx$
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