$4\mathrm{.}3.$ Consider two$-$dimensional, incompressible flow over a cylinder. For ease of use with the nomenclature of the current chapter, we will assume that the windward plane of symmetry $($i$.$e$.,$ the stagnation point$)$ is $=0$ and that $$ increases in the streamwise direction. Thus,

$u_e=2U_{}sin$ and $x=R$

Determine the values of $,$ at $=30,$ at $=45,$ and at $=90.$