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$\int\left(-2a+6b\right)\left(6b+2a\right)db$
Learn how to solve integral calculus problems step by step online. Find the integral of (-2a+6b)(6b+2a). Find the integral. Rewrite the integrand \left(-2a+6b\right)\left(6b+2a\right) in expanded form. Expand the integral \int\left(36b^2-4a^2\right)db into 2 integrals using the sum rule for integrals, to then solve each integral separately. The integral \int36b^2db results in: 12b^{3}.