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$\int\left(a+b\right)^2db$
Learn how to solve integral calculus problems step by step online. Integrate the function (a+b)^2. Find the integral. Rewrite the integrand \left(a+b\right)^2 in expanded form. Expand the integral \int\left(a^{2}+2ab+b^{2}\right)db into 3 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int a^{2}db results in: \frac{a^{3}}{3}.