Find the differential of the function f(x, y) = xe -y at the point (4, 0). df = dx - dy Find the differential of the function g(x, t) = x2 sin(10t) at the point (7, pi/20). dg = dx + dt Find the differential of the function P(L, K) = 1.05 L 0.28 K 0.72 at the point (100, 1). Give your answer to 3 decimal places. dP dL + dK