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