Find   $\displaystyle {\sin{{\left(\frac{{u}}{{2}}\right)}}}$   if   $\displaystyle {\csc{{u}}}={1.049}$   and $\displaystyle {u}$ is in Quadrant-II.
$\displaystyle {\sin{{\left(\frac{{u}}{{2}}\right)}}}=$
Your answer should be accurate to 4 decimal places.