\(\eqalign{
& y' = \left[ {{{(3{x^2} - 1)}^{( - \sqrt 2 )}}} \right]' \cr
& = - \sqrt 2 {(3{x^2} - 1)^{( - \sqrt 2 - 1)}}.(3{x^2} - 1)' \cr
& = - \sqrt 2 {(3{x^2} - 1)^{( - \sqrt 2 - 1)}}.6x \cr
& = - 6 - \sqrt 2 x{(3{x^2} - 1)^{( - \sqrt 2 - 1)}} \cr} \)