Return the hyperbolic cosine of {expr} as a |Float| in the range [1, inf]. {expr} must evaluate to a |Float| or a |Number|. Examples: :echo cosh(0.5) 1.127626 :echo cosh(-0.5) -1.127626 Can also be used as a |method|: Compute()->cosh() {only available when compiled with the |+float| feature}