C 4 2c 5 4 c 2 July 8, 2019 16 32 64 128 4 5 =−4c+ 4 1 4 5c-2 3c+0 2c (c ^ 2 + 4c + 4)/(c ^ 2 - 4) / (c + 2) C(4 2) = (c ^ 2 + 4c + 4)/(c ^ 2 - 4)
