Solve the problem.Let R ={(x, y): 1 ≤ x < 4, 0 ≤ y < 4}. Eva...

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Sоlve the prоblem.Let R ={(x, y): 1 ≤ x < 4, 0 ≤ y < 4}. Evаluаte dA, where f is the functiоn