Greetings, I got a Q on directional derivatives.(adsbygoogle = window.adsbygoogle || []).push({});

The derivative of f(x,y) at (1,2) in the direction of [1,1] is 2(2)^.5 and in the direction of [0, -2] is -3. What is the derivative of f in the direction of [-1, -2]??

Thank you!

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# Homework Help: Directional derivatives

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