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LARCALC11M 13.6.024. Find the directional derivative of the function at P in the direction of V. f(x,y,z)=xy+yz+xz,P(5,6,−5),v=10i+j−k LARCALC11M 13.10.005. Use Lagrange multipliers to find the indicated extrema, assuming that x and y are positive. Minimize f(x,y)=x2+y2 Constraint: x+2y−5=0 f(x)= 2 LARCALC11M 13.10.017 Use Lagrange multipliers to find the indicated extrema of f subject to two constraints, assuming that x,y, and z are nonnegative. Maximize f(x,y,z)=xyz Constraints: x+y+z=32,x−y+z=12 f()=