2a 3 6 1 2 1 9 a 2 July 8, 2019 16 32 64 128 (6/(a ^ 2 - 9) + 1/(3 - a)) * (a ^ 2 + 6a + 9)/5 2) (4a ^ 2 - 1)/(a ^ 2 - 9) / ((6a + 3)/(a + 3)) (a ^ 2 - 9)/(2a ^ 2 + 1) * ((6a + 1)/(a - 3) + (6a - 1)/(a + 3)) (4a ^ 2 - 1)/(a ^ 2 - 9) / ((6a + 3)/(a + 3))
