Question

Calcule o valor do determinante da matriz
A= [sen X -cos X]
[cos X -sen X] ​

Answer 1

Explicação passo-a-passo:

66)

a)

$$\begin{lgathered}\displaystyle \det \left|\begin{array}{ccc}x&x+1\\8&3\end{array}\right|=3x-8x-8=\boxed{-5x-8}\end{lgathered}$$

b)

$$\begin{lgathered}\displaystyle \det \left|\begin{array}{ccc}x&2\\x+2&3x+1\end{array}\right|=3x^2+x-2x-4=\boxed{3x^2-x-4}\end{lgathered}$$

acho que tá certo;-;