Stan Math Library  2.15.0
reverse mode automatic differentiation
cos.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_COS_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_COS_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 #include <cmath>
6 
7 namespace stan {
8  namespace math {
9 
10  template <typename T>
11  inline
12  fvar<T>
13  cos(const fvar<T>& x) {
14  using std::sin;
15  using std::cos;
16  return fvar<T>(cos(x.val_), x.d_ * -sin(x.val_));
17  }
18 
19  }
20 }
21 #endif
fvar< T > cos(const fvar< T > &x)
Definition: cos.hpp:13
var cos(const var &a)
Return the cosine of a radian-scaled variable (cmath).
Definition: cos.hpp:49
fvar< T > sin(const fvar< T > &x)
Definition: sin.hpp:12

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