Solution
= Solution
The <curl of a gradient> is zero. Consequently the <dot product> in the exponent vanishes and
$$
\boxed{\exp[\nabla\phi\cdot(\nabla\times\nabla\phi)]=e^0=1}.
$$
= Solution
The <curl of a gradient> is zero. Consequently the <dot product> in the exponent vanishes and
$$
\boxed{\exp[\nabla\phi\cdot(\nabla\times\nabla\phi)]=e^0=1}.
$$