Which is the correct fundamental period of cot inverse x?

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SUMMARY

The fundamental period of cot inverse x is a topic of debate, with two primary conventions presented in literature. S.L. Loney's "TRIGONOMETRY" states the period as -π/2 to +π/2, while M.L. Khanna's "IIT MATHEMATICS" claims it is 0 to π. The choice of interval is essential for defining the inverse of a non one-to-one function, and the selection of the interval is largely a matter of convention. For examination purposes, understanding both conventions is crucial.

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What is the fundamental period of cot inverse x?
The book, “TRIGONOMETRY “by S.L.Loney says it is –pi/2 to +pi/2 whereas IIT MATHEMATICS by M.L.Khanna says that is 0 to pi
 
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If f is a non one-to-one function, then, in order to define its "inverse" you must restrict it to an interval on which it is one-to-one. Which such interval you choose is a matter of convention. And for tangent, those are two commonly used conventions.
 
But examination point of view which one to choose?
 

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