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$\int\frac{x^4-81}{x-3}dx$
Learn how to solve integral calculus problems step by step online. Integrate the function (x^4-81)/(x-3). Find the integral. Rewrite the expression \frac{x^4-81}{x-3} inside the integral in factored form. We can solve the integral \int\left(x^{2}+9\right)\left(x+3\right)dx by applying integration by parts method to calculate the integral of the product of two functions, using the following formula. First, identify u and calculate du.