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

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

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

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

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

The value of cos^(-1 )(cos((33 pi) /(5))) is

Simplify: cos^(-1)((sinx+cosx)/(sqrt(2))), pi/4

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