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1. a) Find the area of the lower half of the circle x^2 + y^2 =...

1. a) Find the area of the lower half of the circle x^2 + y^2 = 9. Do this by setting it up as an integral and solving the integral. (Should your answer be positive or negative? Please show your work)

b) Find the area of a square of side length L by setting it up as an integral.

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