Suppose that U(x; y) = xe' + ysin z, and that x, y and z can be measured with maximuma possible errors of ±0,8 units, ±0,5 units and t units respectively. Estimate the 15 maximum possible error in calculating U if x=2, y= In 3 and z=.

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A: P2+q2 =1 given therefore 1x =pz P =x/z.  ...(1) q2 =1-p2      =(z2 -x2)/z2 q =z2-x2z ....(2)

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