Exam 13: Partial Derivatives

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Evaluate Evaluate   . .

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Find the minimum sum of 9x + 5y + 3z + 8 if x, y, and z are positive numbers such that xyz = 25.

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Let f(x, y) = 2x + 2x4y3. Then, Let f(x, y) = 2x + 2x<sup>4</sup>y<sup>3</sup>. Then,

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Evaluate the limit Evaluate the limit   by converting to spherical coordinates   ,and observe that   if and only if   , since   . by converting to spherical coordinates Evaluate the limit   by converting to spherical coordinates   ,and observe that   if and only if   , since   . ,and observe that Evaluate the limit   by converting to spherical coordinates   ,and observe that   if and only if   , since   . if and only if Evaluate the limit   by converting to spherical coordinates   ,and observe that   if and only if   , since   . , since Evaluate the limit   by converting to spherical coordinates   ,and observe that   if and only if   , since   . .

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Let Let   . Find   . . Find Let   . Find   . .

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Use the Lagrange multiplier method to find three positive numbers whose sum is 16 and whose product, x2yz is a maximum.

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Compute the local linear approximation to Compute the local linear approximation to   at   . at Compute the local linear approximation to   at   . .

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Evaluate Evaluate   . .

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Find Find   and   if   . and Find   and   if   . if Find   and   if   . .

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Evaluate Evaluate   . .

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Use the Lagrange multiplier method to find the volume of the largest rectangular box that can be inscribed in the ellipsoid 2x2 + 3y2 + 4z2 = 12.

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Let Let   , find   . , find Let   , find   . .

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The level curve of The level curve of   when   is when The level curve of   when   is is

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The legs of a right triangle are measured to be The legs of a right triangle are measured to be   and   inches with a maximum error of   inches in each measurement. Use differentials to estimate the maximum possible error in the calculated value of the hypotenuse. and The legs of a right triangle are measured to be   and   inches with a maximum error of   inches in each measurement. Use differentials to estimate the maximum possible error in the calculated value of the hypotenuse. inches with a maximum error of The legs of a right triangle are measured to be   and   inches with a maximum error of   inches in each measurement. Use differentials to estimate the maximum possible error in the calculated value of the hypotenuse. inches in each measurement. Use differentials to estimate the maximum possible error in the calculated value of the hypotenuse.

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