C 25 2x 3 5 3 2 4 2 July 8, 2019 16 32 64 128 (c ^ 2 + 25)/(c ^ 2 - 25) - c/(c + 5) C c-5 + (c ^ 2)/((c - 5) ^ 2) * (25 - c ^ 2)/(5c + 25)