Cos inverse 1 by root 3 value July 8, 2019 16 32 64 128 Find the principal value of cos inverse minus 1 by root 3 Find the value of cos inverse 1 by 2 tan inverse root 3 Cos 1 cos 2 cos 3 Cosa=1 3 cos(a+b)=-1 3 求a b∈(0 p 2)求cos(a-b)
