Exam 13: Functions of Several Variables

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Let xeyz+yexz+xyz=0x e ^ { y z } + y e ^ { x z } + x y z = 0 . If Z is a function of x and y, then zy(x,y,z)z _ { y } ( x , y , z ) is

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Let f(x,y)=x34log7(x2)+sin1(xy)f ( x , y ) = x ^ { 3 } - 4 \log _ { 7 } \left( x ^ { 2 } \right) + \sin ^ { - 1 } ( x y ) . Then fx(x,y)f _ { x } ( x , y ) is

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

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

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Let f(x,y)=sin(xy+y2)f ( x , y ) = \sin \left( x y + y ^ { 2 } \right) . Then fyx(x,y)f _ { y x } ( x , y ) is

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The limit lim(x,y)(0,0)x2y4x4+y4\lim _ { ( x , y ) \rightarrow ( 0,0 ) } \frac { x ^ { 2 } y ^ { 4 } } { x ^ { 4 } + y ^ { 4 } } is

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Let z=e5xyz = e ^ { 5 x y } . Then the differential dzd ^ { z } is

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Let y2z2+x2z2+x2y2x2y2z24936=0\frac { y ^ { 2 } z ^ { 2 } + x ^ { 2 } z ^ { 2 } + x ^ { 2 } y ^ { 2 } } { x ^ { 2 } y ^ { 2 } z ^ { 2 } } - \frac { 49 } { 36 } = 0 . If Z is a function of x and y, then zx(1,2,3)z _ { x } ( - 1,2,3 ) is

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The domain of the function f(x,y)=ln(2x2y2)f ( x , y ) = \ln \left( 2 x ^ { 2 } - y ^ { 2 } \right) is

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The domain of the function f(x,y)=x2x+3yf ( x , y ) = \frac { x } { \sqrt { 2 x + 3 y } } is

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Let f(x,y)=xy+3f ( x , y ) = x y + 3 . Then f(x+Δx,y)f(x,y)f ( x + \Delta x , y ) - f ( x , y ) is

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Let f(x,y)=x2sin2(xy)f ( x , y ) = \frac { x ^ { 2 } } { \sin ^ { 2 } ( x y ) } . Then fy(x,y)f _ { y } ( x , y ) is

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Let f(x,y)=exy2f ( x , y ) = e ^ { x y ^ { 2 } } . Then fx(x,y)f _ { x } ( x , y ) is

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Let z=x2y2z = x ^ { 2 } - y ^ { 2 } where x = 3r - s, y = r + 2s. When r = 1, s = 1, zrz _ { r } is

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Consider a right circular cone with radius 4 inches and height 8 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 domain of the function f(x,y)=ln(2x2+y2)f ( x , y ) = \ln \left( 2 x ^ { 2 } + y ^ { 2 } \right) is

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Let f(x,y)=x+2yf ( x , y ) = x + 2 y . Then f(x,y+Δy)f(x,y)f ( x , y + \Delta y ) - f ( x , y ) is

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Let z=x2yxy2z = x ^ { 2 } y - x y ^ { 2 } , where x=sintx = \sin t and y=ety = e ^ { t } . When is

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Let f(x,y)={x2+yx2+y2(x,y)(0,0)0(x,y)=(0,0)f ( x , y ) = \left\{ \begin{array} { c c } \frac { x ^ { 2 } + y } { x ^ { 2 } + y ^ { 2 } } & ( x , y ) \neq ( 0,0 ) \\0 & ( x , y ) = ( 0,0 )\end{array} \right. . Then f is

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Let w=(x+2y+3z)4w = ( x + 2 y + 3 z ) ^ { 4 } , where x = s + t, y = s - t, z = st. When s = 0, t = 1, wtw _ { t } is

(Multiple Choice)
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