\(\mathop \int\!\!\!\int \nolimits_S^{} \left( {\phi \nabla \psi - \psi \nabla \phi } \right) \cdot d\bar s = ?\)
1
\(\iiint_{V}{\left( \psi {{\nabla }^{2}}\psi +\psi {{\nabla }^{2}}\psi \right)dV}\)
2
\(\iiint_{V}{\left( \psi {{\nabla }^{2}}\phi +\phi {{\nabla }^{2}}\psi \right)dV}\)
3
\(\iiint_{V}{\left( \phi {{\nabla }^{2}}\psi -\psi {{\nabla }^{2}}\phi \right)dV}\)
4
\(\iiint_{V}{\left( \psi {{\nabla }^{2}}\phi -\phi {{\nabla }^{2}}\psi \right)dV}\)