1. For the following given functions, find the gradient and directional derivatives in the direction of given vectors at the given points: (2+2)*3 = 12 points i. f(x,y)=xy, at point P(-5,5), in the direction of vector v=31-4j ii. f(x,y)=xy, at point P(-2,0), in the direction of vector v =1/21 +3/2j iii. f(x,y)=x -y, at point P(1,0), in the direction of vector v =3/21 +1/2