The maximum efficiency of spiral gears is (where ≈í‚àè = Shaft angle, and ≈ì√ú = Friction angle)$

cos (≈í‚àè - ≈ì√ú) + 1/ cos (≈í‚àè + ≈ì√ú) + 1

sin (≈í‚àè + ≈ì√ú) + 1/ cos (≈í‚àè - ≈ì√ú) + 1

cos (≈í‚àè - ≈ì√ú) + 1/ sin (≈í‚àè + ≈ì√ú) + 1

cos (≈í‚àè + ≈ì√ú) + 1/ cos (≈í‚àè - ≈ì√ú) + 1

The maximum efficiency of spiral gears is (where ≈í‚àè = Shaft

1.	The maximum efficiency of spiral gears is (where ≈í‚àè = Shaft angle, and ≈ì√ú = Friction angle)$
A.	sin (≈í‚àè + ≈ì√ú) + 1/ cos (≈í‚àè - ≈ì√ú) + 1
B.	cos (≈í‚àè - ≈ì√ú) + 1/ sin (≈í‚àè + ≈ì√ú) + 1
C.	cos (≈í‚àè + ≈ì√ú) + 1/ cos (≈í‚àè - ≈ì√ú) + 1
D.	cos (≈í‚àè - ≈ì√ú) + 1/ cos (≈í‚àè + ≈ì√ú) + 1
Answer» D. cos (≈í‚àè - ≈ì√ú) + 1/ cos (≈í‚àè + ≈ì√ú) + 1

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The maximum efficiency of spiral gears is (where ≈í‚àè = Shaft angle, and ≈ì√ú = Friction angle)$

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