The maximum efficiency of a square threaded screw is
(A) (1 - sinφ)/ (1 + sinφ)
(B) (1 + sinφ)/ (1 - sinφ)s
(C) (1 - sinφ)/ (1 + cosφ)
(D) (1 + cosφ)/ (1 - sinφ)
(A) (1 - sinφ)/ (1 + sinφ)
(B) (1 + sinφ)/ (1 - sinφ)s
(C) (1 - sinφ)/ (1 + cosφ)
(D) (1 + cosφ)/ (1 - sinφ)