Exam 13: Functions of Several Variables

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Let w=eyz+exz+exyw = e ^ { y z } + e ^ { x z } + e ^ { x y } . Then the differential dwd ^ { w } is

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Let z=sin(xy)z = \sin ( x y ) . Then the differential dzd ^ { z } is

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Consider a rectangular solid with a square end of side length 10 inches and a length of 20 inches. If the measurements are accurate to within 0.1 inch, then the estimated error of the volume in cubic inches using differential is ​

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The symmetric equations of the tangent line to the curve of intersection of the surface z=x2+y2z = x ^ { 2 } + y ^ { 2 } and the plane y = 2 at the point (1, 2, 5) are

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Let z=xcosy+ysinxz = x \cos y + y \sin x . Then the differential dzd ^ { z} is

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The domain of the function f(x,y)=sin(x+y)f ( x , y ) = \sin ( x + y ) is

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Let z=2x2+xyy2z = 2 x ^ { 2 } + x y - y ^ { 2 } . Then the change of z from (2, -1) to (2.1, -1.1) approximated by dzd z is

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Let z=x2+y2z = x ^ { 2 } + y ^ { 2 } . Then Δz\Delta z , the change of z from (1, 3) to (1.1, 3.2), is

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Let z=3x2+xy2y3z = 3 x ^ { 2 } + x y - 2 y ^ { 3 } . Then the differential dzd ^ { z} is

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Let z=ex2+y2z = e ^ { x ^ { 2 } + y ^ { 2 } } . Then the differential dzd ^ { z } is

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Let w=ex2+y2+z2w = e ^ { x ^ { 2 } + y ^ { 2 } + z ^ { 2 } } . Then the differential dwd ^ { w } is

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Let f(x,y)=x1y+2f ( x , y ) = \frac { x - 1 } { y + 2 } . Then f(x,y+Δy)f(x,y)f ( x , y + \Delta y ) - f ( x , y ) is

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Let w=ln(xyz)w = \ln ( x y z ) where x = t, y = t + 1, and z = t + 2. When t = 1, dzdt\frac { d z } { d t } is

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Let f(x,y)=xyf ( x , y ) = \frac { x } { y } . Then f(x,y+Δy)f(x,y)f ( x , y + \Delta y ) - f ( x , y ) is

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Let z=ln(x2+y2)z = \ln \left( \sqrt { x ^ { 2 } + y ^ { 2 } } \right) . Then the differential dzd ^ { z } is

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The limit lim(x,y,z)(2,1,1)xyzx2(y+z)2\lim _ { ( x , y , z ) \rightarrow ( 2,1,1 ) } \frac { x - y - z } { x ^ { 2 } - ( y + z ) ^ { 2 } }

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The limit lim(x,y)(0,0)sin(xy)xy\lim _ { ( x , y ) \rightarrow ( 0,0 ) } \frac { \sin ( x - y ) } { x - y } is

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Let f(x,y)=3x22y3f ( x , y ) = \sqrt { 3 x ^ { 2 } - 2 y ^ { 3 } } . Then fxy(x,y)f _ { x y } ( x , y ) is

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The symmetric equations of the tangent line to the curve of intersection of the surface z=16x2y2z = 16 - x ^ { 2 } - y ^ { 2 } and the plane y = 2 at the point (1, 2, 11) are

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Let f(x,y)=ln(x2+y2)f ( x , y ) = \ln \left( \sqrt { x ^ { 2 } + y ^ { 2 } } \right) . Then fxx(x,y)f _ { x x } ( x , y ) is

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