p=(c*cosh(u/c)*cos(v), c(cosh(u/c)*sin(v),u)

a. find dx/du|p and dx/dv|p

im confused is x the x component of p? or is p meant to be x(p) in which differentiate all of it... i think i am as all my other example have x(p), could anyone just say if thats what im supposed to do?