Hidden Label: left parenthesis, "r" left parenthesis, "a" , right parenthesis times cos "a" , "r" left parenthesis, "a" , right parenthesis times sin "a" , right parenthesis equals left parenthesis, negative 1.3 6 5 4 8 3 2 4 5 6 8 , 3.9 9 6 9 0 2 6 1 4 7 6 , right parenthesis Has graph. To audio trace, press ALT+T.ra·cosa,ra·sina