\pi \int _{0.1}^{13.1}\left(0.0001x^7-0.0001x^6+0.01x^5-0.07x^4+0.5x^3-2.57x^2+9.88x+5.15\right)^2dx
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\pi \int _{0.1}^{13.1}\left(0.0001x^7-0.0001x^6+0.01x^5-0.07x^4+0.5x^3-2.57x^2+9.88x+5.15\right)^2dx
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MathBot is working on a solution to your problem.