What is the directional derivative of f(x,y)=xy+ln(x2+y2)f(x,y) = xy + \ln(x^2 + y^2)f(x,y)=xy+ln(x2+y2) at (1,1)(1,1)(1,1) in the direction of v⃗=(3,4)\vec{v} = (3, 4)v=(3,4)?
222
125\frac{12}{5}512
145\frac{14}{5}514
333