3) Find for F(x, y) = sinxy + my? - x = 0. 4) If f(x,y) = = (x2 + 2y?) + 2 and v = (1, -V3), a) Find the derivative of f in the direction of i at (3, 2) b) Graph f showing the point P(3, 2, f(3,2)) and a tangent line at P in the direction of D