Using Von Karman in transport phenomena

A researcher suggests using the velocity expression shown below in the von-Karm equation to evaluate the boundary layer thickness of the laminar region for a flu flowing over a flat plate: vx=asin(by) x is the horizantal distance from the edge of the plat and y is the vertical distance fror the plate wall. a) Show that the parameters a and b are given by: a=v(constantfreestreamvelocity);b=2(x) b) Show that the wall shear stress is given by: w=Rex0.328v2