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sin(xy)+z^2=sin(x+z) ycos(xy)+2z(δz/δx)= [ 1+(δz/δx)] cos(x+z) [2z - cos(x+z)](δz/δx)= cos(x+z)- ycos(xy) δz/δx = [cos(x+z)- ycos(xy)]/[2z - cos(x+z)]
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