Function f : R R is defined by f(x, y) = sin(x) + arctan (ry). Find...

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Function f : R R is defined by f(x, y) = sin(x) + arctan (ry). Find min f(x,y), (x,y)=S where S = [0, 2] [1, 1] = {(x, y) | x = [0, 2], y [1,1]}, and determine where this minimum is achieved. Function f : R R is defined by f(x, y) = sin(x) + arctan (ry). Find min f(x,y), (x,y)=S where S = [0, 2] [1, 1] = {(x, y) | x = [0, 2], y [1,1]}, and determine where this minimum is achieved.