Analise as afirmações abaixo.

I. !$ Det \begin{pmatrix}sen(x) \,\,\,\,\, -cos(x) \\sen(y) \,\,\,\,\,\,\,\,\,\,\,\,\, cos(y) \end {pmatrix} \, = \, sen(x+y) !$

II. !$ Det \begin{pmatrix}2m^2 \,\,\, 2m^4 - m \\ m \,\,\,\,\,\,\,\,\,\,\,\,\, m^3-1 \end {pmatrix} \, = \, -m^2 !$

III. !$ Det \begin{pmatrix}sen(x) \,\,\,\,\, -cos(x) \\cos(x) \,\,\,\,\,\,\,\,\,\,\,\,\, sen(x) \end {pmatrix} \, = \, 1 !$

Assinale a alternativa correta.