Question

find the linearization L(x,y) of the function f(x,y) at the point Po. Then find an upper bound for the magnitude |E| of the error in the approximation f(x,y)~L(x,y) over the rectangle R. f(x,y)=(xy^2)+(ycos(x-1)) at Po(1,2) R: |x-1| <= 0.1 , |y-2|<=0.1