CommandscschOn this pagecsch csch (x) The csch function returns the hyperbolic cosecant of x. csch(x)=1sinh(x)=2ex−e−x.\displaystyle \operatorname{csch}(x)=\frac{1}{\sinh (x)}=\frac{2}{e^{x}-e^{-x}} .csch(x)=sinh(x)1=ex−e−x2. In complex expressions, x is complex, and csch(x) returns a complex value. See Also cosh, tanh, coth, sech