The maximum efficiency of a square threaded screw is
A. $$\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}$$
B. $$\frac{{1 + \sin \varphi }}{{1 - \sin \varphi }}$$
C. $$\frac{{1 - \sin \varphi }}{{1 + \cos \varphi }}$$
D. $$\frac{{1 + \cos \varphi }}{{1 - \sin \varphi }}$$
Answer: Option A

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