Translations:Documentation/Calc Functions/CSC/17/en

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    Mathematically, the cosecant of any integer multiple of π, i.e. {......-2π, -π, 0, π, 2π.....} is undefined. For this reason, CSC reports an error when its argument is equal to 0. However, because of the inherent inaccuracy in representing π numerically, CSC does not report errors for other argument values. You should be aware that CSC will return large positive or negative results for non-zero integer values of π.