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área da elipse x^2/9 + y^2/4 = 1 via A = 4integrate from 0 to 3 of (2/3)sqrt(9 - x^2) dx
área da elipse x^2/9 + y^2/4 = 1 via A = 4integrate from 0 to 3 of (2/3)sqrt(9 - x^2) dx
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