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The integral $\int1du$ results in: $u$
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$u$
Learn how to solve differential calculus problems step by step online. Find the integral int(x/(1+x))dx. The integral \int1du results in: u. The integral \int\frac{-1}{u}du results in: -1. Gather the results of all integrals. As the integral that we are solving is an indefinite integral, when we finish integrating we must add the constant of integration C.