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Suppose f(x,y)=sqrt(tan(x)+y) and u is the unit vector in the direction of 〈2,−1〉. Then, (a) ∇f(x,y)=∇f(x,y)=...

Suppose f(x,y)=sqrt(tan(x)+y) and u is the unit vector in the direction of 〈2,−1〉. Then,

(a) ∇f(x,y)=∇f(x,y)=

(b) ∇f(0.4,9)=∇f(0.4,9)=

(c) fu(0.4,9)=Duf(0.4,9)=

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