Expression 2: StartFraction, "x" squared Over "a" squared , EndFraction minus StartFraction, "y" squared left parenthesis, 9 minus "a" squared , right parenthesis Over 49 "a" squared , EndFraction equals 1x2a2−y29−a249a2=1
2
Hidden Label: left parenthesis, 3 , 7 , right parenthesis3,7