Algèbre linéaire Exemples

$[\begin{array}{c} 0 & \cos (x) & \sin (x) \\ 0 & - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \\ 0 & 3 \cos (x) + 4 \sin (x) & - 4 \cos (x) + 3 \sin (x) \end{array}]$

Step 1

Multiply every element in the

$1 s t$ column by its cofactor and add.

$0 | \begin{array}{c} - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \\ 3 \cos (x) + 4 \sin (x) & - 4 \cos (x) + 3 \sin (x) \end{array} | + 0 | \begin{array}{c} \cos (x) & \sin (x) \\ 3 \cos (x) + 4 \sin (x) & - 4 \cos (x) + 3 \sin (x) \end{array} | + 0 | \begin{array}{c} \cos (x) & \sin (x) \\ - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \end{array} |$

Step 2

Multipliez

$0$ par

$| \begin{array}{c} - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \\ 3 \cos (x) + 4 \sin (x) & - 4 \cos (x) + 3 \sin (x) \end{array} |$ .

$0 + 0 | \begin{array}{c} \cos (x) & \sin (x) \\ 3 \cos (x) + 4 \sin (x) & - 4 \cos (x) + 3 \sin (x) \end{array} | + 0 | \begin{array}{c} \cos (x) & \sin (x) \\ - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \end{array} |$

Step 3

Multipliez

$0$ par

$| \begin{array}{c} \cos (x) & \sin (x) \\ 3 \cos (x) + 4 \sin (x) & - 4 \cos (x) + 3 \sin (x) \end{array} |$ .

$0 + 0 + 0 | \begin{array}{c} \cos (x) & \sin (x) \\ - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \end{array} |$

Step 4

Multipliez

$0$ par

$| \begin{array}{c} \cos (x) & \sin (x) \\ - 2 \cos (x) - \sin (x) & \cos (x) - 2 \sin (x) \end{array} |$ .

$0 + 0 + 0$

Step 5

Simplifiez le déterminant.

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Additionnez

$0$ et

$0$ .

$0 + 0$

Additionnez

$0$ et

$0$ .

$0$