Better to write explicitely that (NOT 2x) and .

(NOT 2) and /

. What is the derivative of 6x with respect to y?

. What is the derivative of [itex]-8y^3[itex] with respect to x?

Now I know there should be 4 second order Derivatives and i remember how to work the first two out which are:

= 2

= -24y²

However I become stuck on working out the last two which I believe should be the same.

I know what they are they are the Zxy and Zyx and I know they are the same but could someone explain how i calculate these thanks.

�I know what theI kk