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

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

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