acos.hpp

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#ifndef STAN_MATH_FWD_FUN_ACOS_HPP
#define STAN_MATH_FWD_FUN_ACOS_HPP
 
#include <stan/math/fwd/core.hpp>
#include <stan/math/fwd/meta.hpp>
#include <stan/math/prim/fun/square.hpp>
#include <stan/math/prim/fun/acos.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> acos(const fvar<T>& x) {
  using std::acos;
  using std::sqrt;
  return fvar<T>(acos(x.val_), x.d_ / -sqrt(1 - square(x.val_)));
}
 
template <typename T>
inline std::complex<fvar<T>> acos(const std::complex<fvar<T>>& x) {
  return internal::complex_acos(x);
}
 
}  // namespace math
}  // namespace stan
#endif