In case the number of teeth on two bevel gears in mesh is 30 and 60 respectively, then the pitch cone angle of the gear will be
(b) п/2 + tan^-12
(c) п/2 – tan^-10.5
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This intriguing question comes from Standard Spur Gears-1 topic in portion Toothed Gearing & Gear Trains of Machine Kinematics