The equations P C = P A × cos ( υ 1 ) and P D = P B × cos ( υ 2 ) in a form so that they are applicable for zenith angles.

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Chapter 11, Problem 11.28P

To determine

The equations PC=PA×cos(υ1) and PD=PB×cos(υ2) in a form so that they are applicable for zenith angles.

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