# Stoke's and Gauss's Theorum in proving div(curlA)=0

## Homework Statement

The problem puts forth and identity for me to prove:
or
. It says that I can use "straight-forward" calculation to solve this using the definition of nabla or I can use Gauss's and Stoke's Theorum on an example in which I have a solid 3D shape nearly cut in two by a curve C.

## Homework Equations

Divergence Theorum
Stoke's Theorum

## The Attempt at a Solution

I just can't seem to figure out how to start this. The two equations above are clearly suited to proving this identity, but I just can't see how.