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a) Calculate the integral: 12 1 SS 3 dy dx 02x (1+y) b) Find the blade mass enclosed by the curves x + 3y

a) Calculate the integral: 12 1 SS 3 dy dx 02x (1+y) b) Find the blade mass enclosed by the curves x + 3y = 0 and x - y + 4 = O with density 8(x, y) = y.

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