Q2: 2 2 - yz + > ( 4 + 1 Let f(my ) = e and let u = (1/2,13/2 1 ) Find the directional derivative Duf ( 1.2 ) 2) Determine a direction, V such that Dyf( 1,2)= 0 3) Determine an equation of tangent for f(x,y) = 1 at the point ( 1, 2)