Cos inverse negative root 3 by 2 July 8, 2019 16 32 64 128 Cos inverse of negative root 3 over 2 Cos inverse of negative square root 3 2 Cos 1 cos 2 cos 3 Inverse of cos Cosa=1 3 cos(a+b)=-1 3 求a b∈(0 p 2)求cos(a-b)
