1) sin²a
2) -2
Пошаговое объяснение:
1)
2)
=(-1)·(-4)·4+1·2·2+(-3)·3·(-2)-(-1)·2·(-2)-1·3·4-(-3)·(-4)·2=16+4+18-4-12-24=-2
![\left[\begin{array}{cc}1&cos a\\cos a&1\end{array}\right] =1-cos^{2}a=sin^{2} a](/tpl/images/0921/5934/67c25.png)
![\left[\begin{array}{ccc}-1&1&-3\\3&-4&2\\2&-2&4\end{array}\right] =](/tpl/images/0921/5934/e65ff.png)
