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