Answer
$(-0.385,-0.24,-0.208)$.
Work Step by Step
Since $\rho=0.5, \, \theta=3.7, \, \phi=2$ and
$$ x=\rho\cos \theta\sin \phi,\quad y=\rho\sin\theta\sin\phi, \quad z=\rho\cos \phi,$$
then we have
$$ x=0.5\cos3.7\sin 2=-0.385, $$
$$ y=0.5\sin 3.7\sin 2=-0.24, $$
$$ z=0.5\cos 2=-0.208.$$
Hence, the rectangular coordinates are $(-0.385,-0.24,-0.208)$.
