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Define the function z = f(x,y) = ery - ry. Suppose that r and y are functions of t as follows: x(t) = a + bt and y(t) = ct. 1. Substitute r(t) and y(t) into f(x, y) to obtain g(t) = f(x(t), y(t)). Calculate dg(t) /dt. 2. Calculate do(t)/dt using the Chain Rule for functions of 2 variables. How does your result compare to the result in