Question: The maximum efficiency for spiral gears in mesh is given by (where (theta=) shaft angle and (phi=) friction angle) (a) (frac{1+cos (theta-phi)}{1+cos (theta+phi)}) (b) (frac{1+cos

The maximum efficiency for spiral gears in mesh is given by (where \(\theta=\) shaft angle and \(\phi=\) friction angle)

(a) \(\frac{1+\cos (\theta-\phi)}{1+\cos (\theta+\phi)}\)

(b) \(\frac{1+\cos (\theta+\phi)}{1+\cos (\theta-\phi)}\)

(c) \(\frac{1-\cos (\theta-\phi)}{1+\cos (\theta+\phi)}\)

(d) \(\frac{1-\cos (\theta+\phi)}{1+\cos (\theta-\phi)}\).

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