Involving sech^{-1}((2z)^{1/2}/(z+a)^{1/2})

Involving sech^{-1}((2z)^{1/2}/(z+1)^{1/2}) and cos^{-1}(1/z)

Involving sech^{-1}((2z)^{1/2}/(z-1)^{1/2}) and cos^{-1}(1/z)