Question: Let f be continuous on [0, 1] and let R be the triangular region with vertices (0, 0), (1, 0), and [0, 1]. Show that

Let f be continuous on [0, 1] and let R be the triangular region with vertices (0, 0), (1, 0), and [0, 1]. Show that| f(x + y) dA = [' uf(u) du

| f(x + y) dA = [' uf(u) du

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