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The angle of the threading in the screw is determined by which of the following trigonometric function?

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The angle of the threading in the screw is determined by which of the following trigonometric function?

(a) Tangent Inverse

(b) Sine

(c) Cosine

(d) Secant

The question was posed to me during an interview for a job.

This interesting question is from Frictional Forces on Screws topic in section Friction of Engineering Mechanics

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Best answer
Correct option is (a) Tangent Inverse

The best I can explain: The angle of the threading in the screw is determined by inverse tangent trigonometric function. This is the generalized form of the function which is being used so as to get the value of the angle. In wedges, the same function is used so as to find the angle of a wedge.

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