**Domain and Range of Trigonometric Functions**
https://www.onlinemath4all.com/domain-and-range-of-trigonometric-functions.html

So the domain of csc x is {x | x ≠ ...-2 π, - π, 0, π, 2 π, ..} In the same way, d omain of sec x is {x | x≠ ...-3 π /2, - π /2, π /2, 3 π /2, 5 π /2 ...} Range of csc x and sec x. Let y = csc x. In the trigonometric function y = csc x, when plug values for x such that. x ∈ R - {.....-2 π, - …

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