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

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

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