http://mathworld.i2p/Cosecant.html
See also Flint Hills Series , Inverse Cosecant , Secant , Sine Related Wolfram sites http://functions.wolfram.com/ElementaryFunctions/Csc/ References Abramowitz, M. and Stegun, I. A. (Eds.). "Circular Functions." §4.3 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing.