Let f(x,y)=x3−3xy2+y3f(x, y) = x^3 - 3xy^2 + y^3f(x,y)=x3−3xy2+y3. What is the total differential dfdfdf at (1,−1)(1, -1)(1,−1) given dx=0.01dx = 0.01dx=0.01 and dy=−0.02dy = -0.02dy=−0.02?
0.15
-0.15
0.25
-0.25