Se α e β são dois ângulos complementares, então o determinante da matriz !$ { \begin{bmatrix} sen( \alpha). cos ( \beta)\,\,1\,\,-1\\sen( \beta). cos( \alpha)2\,\,\,\,\,\,\,\,\,\,1\\2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4\,\,\,\,\,\,\,\,\,\,\,\,\,0 \end{bmatrix}} !$ é igual a
