(b) (5 points) Let f = f(x,y) be a differentiable function of r and y, and let x= rs,y =rts and h(r,s) = f(x,y) = f(rs,r+ s). Assume (1,2) = 2, (1, 1) =________
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(1,2) = 2, 
(1, 1) =________