a) Suppose that f, g: R3 R are differentiable at a point (a, b, c), and that
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and
b) Use part a) to find all extrema of f(x, y, z) = 4xy + 2xz + 2yz subject to the constraint xyz = 16.
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af (a , b. c)-(a, b, c)--(a, b, c)dg. (a, b, c) = 0 ах ag az af ах af :az dg dy ag af ay
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