Question: Let f ( x , y ) = t a n - 1 ( 9 x 4 y ) and vec ( u ) =

Let f(x,y)=tan-1(9x4y) and vec(u)=4,2>.
Calculate the gradient offx,y components.gradf=,> help (fractions)
Calculate
Dvec(u)f(2,1)=
Let f ( x , y ) = t a n - 1 ( 9 x 4 y ) and vec (

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