also using other functions from cmath

hyper.h

@@ -38,7 +38,29 @@ using std::stable_sort;
 using std::out_of_range;
 using std::get;
 using std::random_shuffle;
+
 using std::abs;
+using std::isfinite;
+using std::isnan;
+using std::log;
+using std::exp;
+using std::hypot;
+using std::sin;
+using std::cos;
+using std::sinh;
+using std::asinh;
+using std::asin;
+using std::acos;
+using std::asinh;
+using std::acosh;
+using std::tan;
+using std::atan;
+using std::atan2;
+using std::tanh;
+using std::sqrt;
+using std::pow;
+using std::floor;
+using std::ceil;
 
 // genus (in grammar)
 #define GEN_M 0