2a 9 )( 3a 2 4a 4 July 8, 2019 16 32 64 128 (4a ^ 2 - 9)/(2a ^ 2 - 9a - 18) (3a - 9)/(a + 2) / ((a ^ 2 - 9)/(a ^ 2 - 4)) (4a ^ 2 - 9)(1/(2a - 3) - 1/(2a + 3)) (9 – 2a)(9 + 2а)