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2. (3pts) Suppose that R = (x, y) |x 20, y 20,4x3 + y's1) . Find the exact value of cos (4x2 + y? )

2. (3pts) Suppose that R = (x, y) |x 20, y 20,4x3 + y's1) . Find the exact value of cos (4x2 + y? ) dA. R

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