Answer
$$0.6293$$
Work Step by Step
$$\eqalign{
& \sin {39^ \circ } \cr
& {\text{using a calculator to find the value }}\left( {{\text{set the calculator in degree mode}}} \right) \cr
& {\text{then}}{\text{, we obain}} \cr
& \sin {39^ \circ } \approx 0.6293 \cr} $$