Remove using statements for complex functions

include/boost/math/tools/complex.hpp

@@ -24,36 +24,6 @@ namespace math {
 template <typename T>
 using complex = cuda::std::complex<T>;
 
-using cuda::std::real;
-using cuda::std::imag;
-using cuda::std::abs;
-using cuda::std::arg;
-using cuda::std::norm;
-using cuda::std::conj;
-using cuda::std::proj;
-using cuda::std::polar;
-
-using cuda::std::exp;
-using cuda::std::log;
-using cuda::std::log10;
-
-using cuda::std::pow;
-using cuda::std::sqrt;
-
-using cuda::std::sin;
-using cuda::std::cos;
-using cuda::std::tan;
-using cuda::std::asin;
-using cuda::std::acos;
-using cuda::std::atan;
-
-using cuda::std::sinh;
-using cuda::std::cosh;
-using cuda::std::tanh;
-using cuda::std::asinh;
-using cuda::std::acosh;
-using cuda::std::atanh;
-
 } // namespace math
 } // namespace boost
 
@@ -68,36 +38,6 @@ namespace math {
 template <typename T>
 using complex = std::complex<T>;
 
-using std::real;
-using std::imag;
-using std::abs;
-using std::arg;
-using std::norm;
-using std::conj;
-using std::proj;
-using std::polar;
-
-using std::exp;
-using std::log;
-using std::log10;
-
-using std::pow;
-using std::sqrt;
-
-using std::sin;
-using std::cos;
-using std::tan;
-using std::asin;
-using std::acos;
-using std::atan;
-
-using std::sinh;
-using std::cosh;
-using std::tanh;
-using std::asinh;
-using std::acosh;
-using std::atanh;
-
 } // namespace math
 } // namespace boost