G.f. method
Returns the hyperbolic cosine of its argument.
cosh x => y
<real>. The angle, in radians.
<float>.
common-extensions
transcendentals
Returns the hyperbolic cosine of its argument. The floating point precision of the result is given by the precision of x. The result is a single-float if x is an integer.
See the functions sinh, page 179 and tanh, page 180.