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Let z=4x2+2y2z = 4 x ^ { 2 } + 2 y ^ { 2 }

Question 83

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Let z=4x2+2y2z = 4 x ^ { 2 } + 2 y ^ { 2 } and suppose that (x,y)( x , y ) changes from (2,−1)( 2 , - 1 ) to (2.01,−0.98)( 2.01 , - 0.98 ) (a) Compute Δz.\Delta z . (b) Compute dzd z

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