_Maximum efficiency of a screw jack for the angle of friction ≈í‚

1.	_Maximum efficiency of a screw jack for the angle of friction ≈í‚àè, is$?
A.	sin ≈í‚àè/(1 + sin ≈í‚àè)
B.	(1 - sin ≈í‚àè)/sin ≈í‚àè
C.	(1 + sin ≈í‚àè)/(1 - sin ≈í‚àè)
D.	(1 - sin ≈í‚àè)/(1 + sin ≈í‚àè)
Answer» E.

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_Maximum efficiency of a screw jack for the angle of friction ≈í‚àè, is$?

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