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The inverse of the cosecant function. Also written arc-cosecant, arc-cosecx, acsc, cosec-1, or csc-1. The value of the arccsc function of any argument is an angle in radians whose cosecant function equals the given argument, that is, y = csc-1x if and only if x = cosec(y) for -
/2 < y < /2 and y 
0.
