Stan Math Library  2.20.0
reverse mode automatic differentiation
tan.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_TAN_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_TAN_HPP
3 
4 #include <stan/math/fwd/meta.hpp>
5 #include <stan/math/fwd/core.hpp>
6 
7 namespace stan {
8 namespace math {
9 
10 template <typename T>
11 inline fvar<T> tan(const fvar<T>& x) {
12  using std::cos;
13  using std::tan;
14  return fvar<T>(tan(x.val_), x.d_ / (cos(x.val_) * cos(x.val_)));
15 }
16 } // namespace math
17 } // namespace stan
18 #endif
fvar< T > cos(const fvar< T > &x)
Definition: cos.hpp:12
T d_
The tangent (derivative) of this variable.
Definition: fvar.hpp:50
T val_
The value of this variable.
Definition: fvar.hpp:45
fvar< T > tan(const fvar< T > &x)
Definition: tan.hpp:11
var tan(const var &a)
Return the tangent of a radian-scaled variable (cmath).
Definition: tan.hpp:46
This template class represents scalars used in forward-mode automatic differentiation, which consist of values and directional derivatives of the specified template type.
Definition: fvar.hpp:41

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