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8. The derivative of f(x, y) at Po(1, 2) in the direction of i+j is 22 and in the direction of -2j is -3.

8. The derivative of f(x, y) at Po(1, 2) in the direction of i+j is 22 and in the direction of -2j is -3. What is the derivative of f in the direction of -i- 2j? Give reasons for your answer.

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