Question

g(u,v)=ucos(u+v)
what is dg/du ?
what is dg/dv ?

Answer 1

Du (u cos(u+1))

u cos(u+v) -u sin(u+v)

Dv(1cos(1+v))

-u sin(u+v)

is what I understand it to be

Answer 2

are you saying solve by substitiution?

Answer 3

*substitution

Answer 4

no... I am assuming that u and v are independant of each other, and that Du is the derivative when v is a constant; and Dv is the derivative when u is held constant.

Answer 5

the (1) is just a place holder to remind me that it is held constant

Answer 6

Oh that's a great way to put it
! Thanks!