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For problems #8 and #9, use polar coordinates to evaluate the integral. Find the exact value, sketch the region, and show your work. 8.

For problems #8 and #9, use polar coordinates to evaluate the integral. Find the exact value, sketch the region, and show your work. 8. x(x + y) dA where R is bounded by the semicircle y = 1- x and the x-axis. 9. dy dx.

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