Recent content by wxyj

thanks , but how did you get the answer?? I don't undestand it...

I do know what that directional derivative is, but can u give a more concrete suggestion?

Can anyone help me with the following question? Find the path of the steepest descent along the surface z=x^3 + 3y^2 from the point (1, -2, 13) to (0,0,0) Note: the general solution of the differential equation f ' (t)-kf(t) =0 is f(t) = ce^kt, where c is an arbitary number...