Determine the coordinate direction angles of F, which is applied to the end A of the pipe

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Determine the coordinate direction angles of F, which is applied to the end A of the pipe assembly, so that the moment of F about O is zero.
Given:
F = 20 lb
a = 8 in
b = 6 in
c = 6 in
d = 10 in


Determine the coordinate direction angles of F, which is applied
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