1.

Please solve in notebook ...

Answer» DETERMINANT =

1( \: (1)(1) - ( {x}^{2} x )) - x( {x}^{2}  -  {x}^{2} ) +  {x}^{2} ( {x}^{4}  - x)

= (1 -  {x}^{3} ) +  {x}^{3} ( {x}^{3}  - 1)

= (1 -  {x}^{3} )^{2}


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