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Two half-circles of the same radius sharing a common edge



Function f3d_75 returns the view factor between two half-circles that share a common edge.  

The calling protocol is:

F=f3d_75(alpha)

Inputs:
alpha: angle (deg or rad)

Example: 
$UnitSystem Radian
alpha=1.5 [rad]
F=f3d_75(alpha)

{Solution:
F=0.273}