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return t.fun_ATANH( to_double( _args[ 0 ] ) ); } break; case ATAN2: if (2 == c ) { return t.fun_ATAN2( to_double( _args[ 0 ] ), to_double( _args[ 1 ] ) ); } break; case COS: if (1 == c ) { return t.fun_COS( to_double( _args[ 0 ] ) );