Simplify ` cos^(-1) cos ((19pi)/3)`

cos^(-1) (cos ((4pi)/3))

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

cos^(-1)cos((2 pi)/(3))

Simplify (I ) cos ^(-1) ( cos ((13 pi )/(3))) (ii ) tan^(-1) ( tan ((3pi)/(4))) (iii ) sec^(-1) ( sec ((5pi )/(3))) (iv ) sin^(-1) [ sin 10 ]

Find cos ^(-1) (cos ((4pi)/3))

cos^(-1)(cos((2 pi)/(3)))

cos^(-1)(-cos(2 pi)/(3))

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