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  3. find the directional derivative of f(x,y)=arctan(x

Find the directional derivative of f(x,y)=arctan(xy) at the point (-2,5) in the direction of maximum...

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Find the directional derivative of f(x,y)=arctan(xy) at the point (-2,5) in the direction of maximum decrease. 

 What is the Domain and Range of f(x,y)=arctan(xy)?

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