tan.hpp

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#ifndef STAN_MATH_REV_FUN_TAN_HPP
#define STAN_MATH_REV_FUN_TAN_HPP
 
#include <stan/math/rev/meta.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/is_inf.hpp>
#include <stan/math/rev/fun/sinh.hpp>
#include <stan/math/rev/fun/tanh.hpp>
#include <stan/math/prim/fun/isinf.hpp>
#include <stan/math/prim/fun/tan.hpp>
#include <cmath>
#include <complex>
 
namespace stan {
namespace math {
 
inline var tan(const var& a) {
  return make_callback_var(std::tan(a.val()), [a](const auto& vi) mutable {
    a.adj() += vi.adj() * (1.0 + vi.val() * vi.val());
  });
}
 
template <typename VarMat, require_var_matrix_t<VarMat>* = nullptr>
inline auto tan(const VarMat& a) {
  return make_callback_var(a.val().array().tan().matrix(),
                           [a](const auto& vi) mutable {
                             a.adj() += vi.adj().cwiseProduct(
                                 (1.0 + vi.val().array().square()).matrix());
                           });
}
 
inline std::complex<var> tan(const std::complex<var>& z) {
  return stan::math::internal::complex_tan(z);
}
 
}  // namespace math
}  // namespace stan
#endif