1 #ifndef STAN_MATH_FWD_SCAL_FUN_ACOSH_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_ACOSH_HPP
fvar< T > sqrt(const fvar< T > &x)
const double NOT_A_NUMBER
(Quiet) not-a-number value.
fvar< T > square(const fvar< T > &x)
var acosh(const var &a)
The inverse hyperbolic cosine function for variables (C99).
fvar< T > acosh(const fvar< T > &x)