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If z=x2−xy+7y2z = x ^ { 2 } - x y + 7 y ^ { 2 }

Question 62

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If z=x2−xy+7y2z = x ^ { 2 } - x y + 7 y ^ { 2 } and (x,y)( x , y ) changes from (2, 1) to (1.94,1.13)( 1.94,1.13 ) find dz.

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