1 #ifndef STAN_MATH_FWD_SCAL_FUN_ACOS_HPP 2 #define STAN_MATH_FWD_SCAL_FUN_ACOS_HPP
T d_
The tangent (derivative) of this variable.
fvar< T > sqrt(const fvar< T > &x)
fvar< T > square(const fvar< T > &x)
var acos(const var &a)
Return the principal value of the arc cosine of a variable, in radians (cmath).
T val_
The value of this variable.
fvar< T > acos(const fvar< T > &x)
This template class represents scalars used in forward-mode automatic differentiation, which consist of values and directional derivatives of the specified template type.