Question: In Exercises 1 5 - 2 0 find the dipection in which f increases most rapidly at the given point, and find the maximal directional

In Exercises 15-20 find the dipection in which f increases most rapidly at the given point, and find the maximal directional derivative at that point.
15.f(x,y)=ex(cosysiny);(0,0)
In Exercises 1 5 - 2 0 find the dipection in

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