A 5 b 4 July 8, 2019 16 32 64 128 A 5 b 4 c 3 d 2 A 5 b 4 c 3 A 5 b 4 3 A 5 b 4 2 A 5 b 4 c 7 A 5 4 b (- 3 2 5 a 4a b 6a A (- 2 5 b 4 1 5 a 4b )+ b 5 a 5b )- 4a b 8 a )+( 5 b )-( 4 a A 4 5 b 1 3 Cos a b 4 5 A 5 b 6 c 4