Simplify `cos^(-1)(cos((5pi)/6))`

cos^(-1) (cos ((5pi)/3))=

cos^(-1)(cos((5 pi)/(4)))

cos^(-1)(cos(13pi/6))

cos^(-1)(cos(5 pi)/(3))=

"cos"^(-1)("cos"((7pi)/(5)))=

cos^(-1) (cos 8pi/5)

cos ^ (- 1) ((cos (13 pi)) / (6))

Evaluate each of the following: cos^(-1){cos(-(pi)/(4))}( ii) cos^(-1)((cos(5 pi))/(4)) (iii) cos^(-1)((cos(4 pi))/(3))