.BG
.FN cosh
.FN sinh
.FN tanh
.TL
Hyperbolic Trigonometric Functions
.CS
cosh(x)
sinh(x)
tanh(x)
.AG x
numeric, in radians, or complex.  Missing values (`NA's) are
allowed.
.RT
data transformed by the specified hyperbolic trigonometric function,
with attributes preserved.
.Tr
See section 5.1.5 for details on domains and branch cuts in the
case of complex arguments.
.En
.KW math
.WR
