Hi there I'm working with some derivatives which I am having a lot of trouble with. Here are the 2 forms I'm stuck on: (1) d/dx (x')^2 , where x is a function of t and x' is the first derivative of x with respect to t. (2) d/dx' (x) , same conditions as above, never seen one of these before. Can anyone help me with the general solutions to these problems? I think the answer to the first one is 2x'' where x'' is the second derivative of x with respect to t, but I'm really not sure and I have no idea with the second one. Thanks for any help provided.