This help topic is for R version 0.60. For the current version of R, try https://stat.ethz.ch/R-manual/R-patched/library/base/html/Hyperbolic.html
Hyperbolic {base}R Documentation

Hyperbolic Functions

Description

These functions give the obvious hyperbolic functions. They respectively compute the hyperbolic cosine, sine, tangent, arc-cosine, arc-sine, arc-tangent.

Usage

cosh(x)
sinh(x)
tanh(x)
acosh(x)
asinh(x)
atanh(x)

See Also

cos, sin, tan, acos, asin, atan.

[Package base version 0.60 ]