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Question 12
The gradient of f(x,y,z) =y2+z2−4xzf ( x , y , z ) = y ^ { 2 } + z ^ { 2 } - 4 x zf(x,y,z) =y2+z2−4xz at (-2, 1, 3) is
A) −12i−2j+14k- 12 \mathbf { i } - 2 \mathbf { j } + 14 \mathbf { k }−12i−2j+14k B) −12i+2j+14k- 12 \mathbf { i } + 2 \mathbf { j } + 14 \mathbf { k }−12i+2j+14k C) −12i+2j−14k- 12 \mathbf { i } + 2 \mathbf { j } - 14 \mathbf { k }−12i+2j−14k D) 12i+2j+14k12 \mathbf { i } + 2 \mathbf { j } + 14 \mathbf { k }12i+2j+14k E) 12i+2j−14k12 \mathbf { i } + 2 \mathbf { j } - 14 \mathbf { k }12i+2j−14k
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