Mathematics, 01.09.2019 08:10 bellbradshaw16

The derivative of f(x, y) at p(1,2) in the direction of i+j is 2sqrt(2) and in the direction of -2j is -3. what is the derivative of f in the direction of -i-2j?

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The derivative of f(x, y) at p(1,2) in the direction of i+j is 2sqrt(2) and in the direction of -2j...