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- Find the directional derivative of f(x,y,z)=yz+x^4 at the point (1,2,3) in the direction of a vector making an angle of pi/6 with f(1,2,3). Fu=?4 Find the directional derivative of f (x,y)= 2x^2 y^2 -3xy at the point (1,-1) in thedirectiona. of vector v =<4,3> and toward the origin.Find the directional derivative of P(x, y, z) = x ^ 3 - x * y ^ 2 - z at B(1,1,0) in the direction of vector A = 2i - 3j + 6k