Question: Suppose f ( x , y ) = t a n ( x ) + y 2 and u i s the unit vector i

Suppose f(x,y)=tan(x)+y2 and uis the unit vector in the direction of(:3,-3:). Then,
(a) gradf(x,y)=
(b) gradf(-0.4,10)=
(c)fu(-0.4,10)=Duf(-0.4,10)=
Suppose f ( x , y ) = t a n ( x ) + y 2 and u i s

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