Álgebra linear Exemplos

$[\begin{array}{c} e^{x} & \cos (x) & \sin (x) \\ e^{x} & - \sin (x) & \cos (x) \\ e^{x} & - \cos (x) & - \sin (x) \end{array}]$

Etapa 1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in row $1$ by its cofactor and add.

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Etapa 1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + \\ - & + & - \\ + & - & + \end{array} |$

Etapa 1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Etapa 1.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

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

Etapa 1.4

Multiply element $a_{11}$ by its cofactor.

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

Etapa 1.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

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

Etapa 1.6

Multiply element $a_{12}$ by its cofactor.

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

Etapa 1.7

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

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

Etapa 1.8

Multiply element $a_{13}$ by its cofactor.

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

Etapa 1.9

Add the terms together.

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

Etapa 2

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

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Etapa 2.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

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

Etapa 2.2

Simplifique o determinante.

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Etapa 2.2.1

Simplifique cada termo.

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Etapa 2.2.1.1

Multiplique $- \sin (x) (- \sin (x))$ .

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Etapa 2.2.1.1.1

Multiplique $- 1$ por $- 1$ .

$e^{x} (1 \sin (x) \sin (x) - (- \cos (x) \cos (x))) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.1.2

Multiplique $\sin (x)$ por $1$ .

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

Etapa 2.2.1.1.3

Eleve $\sin (x)$ à potência de $1$ .

$e^{x} (\sin^{1} (x) \sin (x) - (- \cos (x) \cos (x))) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.1.4

Eleve $\sin (x)$ à potência de $1$ .

$e^{x} (\sin^{1} (x) \sin^{1} (x) - (- \cos (x) \cos (x))) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.1.5

Use a regra da multiplicação de potências $a^{m} a^{n} = a^{m + n}$ para combinar expoentes.

$e^{x} ({\sin (x)}^{1 + 1} - (- \cos (x) \cos (x))) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.1.6

Some $1$ e $1$ .

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

Etapa 2.2.1.2

Multiplique $- \cos (x) \cos (x)$ .

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Etapa 2.2.1.2.1

Eleve $\cos (x)$ à potência de $1$ .

$e^{x} (\sin^{2} (x) - - (\cos^{1} (x) \cos (x))) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.2.2

Eleve $\cos (x)$ à potência de $1$ .

$e^{x} (\sin^{2} (x) - - (\cos^{1} (x) \cos^{1} (x))) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.2.3

Use a regra da multiplicação de potências $a^{m} a^{n} = a^{m + n}$ para combinar expoentes.

$e^{x} (\sin^{2} (x) - - {\cos (x)}^{1 + 1}) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.2.4

Some $1$ e $1$ .

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

Etapa 2.2.1.3

Multiplique $- - \cos^{2} (x)$ .

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Etapa 2.2.1.3.1

Multiplique $- 1$ por $- 1$ .

$e^{x} (\sin^{2} (x) + 1 \cos^{2} (x)) - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 2.2.1.3.2

Multiplique $\cos^{2} (x)$ por $1$ .

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

Etapa 2.2.2

Aplique a identidade trigonométrica fundamental.

$e^{x} \cdot 1 - \cos (x) | \begin{array}{c} e^{x} & \cos (x) \\ e^{x} & - \sin (x) \end{array} | + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 3

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

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Etapa 3.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$e^{x} \cdot 1 - \cos (x) (e^{x} (- \sin (x)) - e^{x} \cos (x)) + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 3.2

Reescreva usando a propriedade comutativa da multiplicação.

$e^{x} \cdot 1 - \cos (x) (- e^{x} \sin (x) - e^{x} \cos (x)) + \sin (x) | \begin{array}{c} e^{x} & - \sin (x) \\ e^{x} & - \cos (x) \end{array} |$

Etapa 4

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

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Etapa 4.1

O determinante de uma matriz $2 \times 2$ pode ser encontrado ao usar a fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$e^{x} \cdot 1 - \cos (x) (- e^{x} \sin (x) - e^{x} \cos (x)) + \sin (x) (e^{x} (- \cos (x)) - e^{x} (- \sin (x)))$

Etapa 4.2

Simplifique cada termo.

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Etapa 4.2.1

Reescreva usando a propriedade comutativa da multiplicação.

$e^{x} \cdot 1 - \cos (x) (- e^{x} \sin (x) - e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) - e^{x} (- \sin (x)))$

Etapa 4.2.2

Multiplique $- e^{x} (- \sin (x))$ .

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Etapa 4.2.2.1

Multiplique $- 1$ por $- 1$ .

$e^{x} \cdot 1 - \cos (x) (- e^{x} \sin (x) - e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + 1 e^{x} \sin (x))$

Etapa 4.2.2.2

Multiplique $e^{x}$ por $1$ .

$e^{x} \cdot 1 - \cos (x) (- e^{x} \sin (x) - e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5

Simplifique o determinante.

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Etapa 5.1

Simplifique cada termo.

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Etapa 5.1.1

Multiplique $e^{x}$ por $1$ .

$e^{x} - \cos (x) (- e^{x} \sin (x) - e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.2

Aplique a propriedade distributiva.

$e^{x} - \cos (x) (- e^{x} \sin (x)) - \cos (x) (- e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.3

Multiplique $- \cos (x) (- e^{x} \sin (x))$ .

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Etapa 5.1.3.1

Multiplique $- 1$ por $- 1$ .

$e^{x} + 1 \cos (x) (e^{x} \sin (x)) - \cos (x) (- e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.3.2

Multiplique $\cos (x)$ por $1$ .

$e^{x} + \cos (x) (e^{x} \sin (x)) - \cos (x) (- e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.4

Multiplique $- \cos (x) (- e^{x} \cos (x))$ .

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Etapa 5.1.4.1

Multiplique $- 1$ por $- 1$ .

$e^{x} + \cos (x) (e^{x} \sin (x)) + 1 \cos (x) (e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.4.2

Multiplique $\cos (x)$ por $1$ .

$e^{x} + \cos (x) (e^{x} \sin (x)) + \cos (x) (e^{x} \cos (x)) + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.4.3

Eleve $\cos (x)$ à potência de $1$ .

$e^{x} + \cos (x) (e^{x} \sin (x)) + \cos^{1} (x) \cos (x) e^{x} + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.4.4

Eleve $\cos (x)$ à potência de $1$ .

$e^{x} + \cos (x) (e^{x} \sin (x)) + \cos^{1} (x) \cos^{1} (x) e^{x} + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.4.5

Use a regra da multiplicação de potências $a^{m} a^{n} = a^{m + n}$ para combinar expoentes.

$e^{x} + \cos (x) (e^{x} \sin (x)) + {\cos (x)}^{1 + 1} e^{x} + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.4.6

Some $1$ e $1$ .

$e^{x} + \cos (x) (e^{x} \sin (x)) + \cos^{2} (x) e^{x} + \sin (x) (- e^{x} \cos (x) + e^{x} \sin (x))$

Etapa 5.1.5

Aplique a propriedade distributiva.

$e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} + \sin (x) (- e^{x} \cos (x)) + \sin (x) (e^{x} \sin (x))$

Etapa 5.1.6

Reescreva usando a propriedade comutativa da multiplicação.

$e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} - \sin (x) e^{x} \cos (x) + \sin (x) (e^{x} \sin (x))$

Etapa 5.1.7

Multiplique $\sin (x) (e^{x} \sin (x))$ .

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Etapa 5.1.7.1

Eleve $\sin (x)$ à potência de $1$ .

$e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} - \sin (x) e^{x} \cos (x) + \sin^{1} (x) \sin (x) e^{x}$

Etapa 5.1.7.2

Eleve $\sin (x)$ à potência de $1$ .

$e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} - \sin (x) e^{x} \cos (x) + \sin^{1} (x) \sin^{1} (x) e^{x}$

Etapa 5.1.7.3

Use a regra da multiplicação de potências $a^{m} a^{n} = a^{m + n}$ para combinar expoentes.

$e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} - \sin (x) e^{x} \cos (x) + {\sin (x)}^{1 + 1} e^{x}$

Etapa 5.1.7.4

Some $1$ e $1$ .

$e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} - \sin (x) e^{x} \cos (x) + \sin^{2} (x) e^{x}$

Etapa 5.2

Combine os termos opostos em $e^{x} + \cos (x) e^{x} \sin (x) + \cos^{2} (x) e^{x} - \sin (x) e^{x} \cos (x) + \sin^{2} (x) e^{x}$ .

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Etapa 5.2.1

Reorganize os fatores nos termos $\cos (x) e^{x} \sin (x)$ e $- \sin (x) e^{x} \cos (x)$ .

$e^{x} + e^{x} \cos (x) \sin (x) + \cos^{2} (x) e^{x} - e^{x} \cos (x) \sin (x) + \sin^{2} (x) e^{x}$

Etapa 5.2.2

Subtraia $e^{x} \cos (x) \sin (x)$ de $e^{x} \cos (x) \sin (x)$ .

$e^{x} + \cos^{2} (x) e^{x} + 0 + \sin^{2} (x) e^{x}$

Etapa 5.2.3

Some $e^{x} + \cos^{2} (x) e^{x}$ e $0$ .

$e^{x} + \cos^{2} (x) e^{x} + \sin^{2} (x) e^{x}$

Etapa 5.3

Fatore $e^{x}$ de $e^{x} + \cos^{2} (x) e^{x} + \sin^{2} (x) e^{x}$ .

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Etapa 5.3.1

Multiplique por $1$ .

$e^{x} \cdot 1 + \cos^{2} (x) e^{x} + \sin^{2} (x) e^{x}$

Etapa 5.3.2

Fatore $e^{x}$ de $\cos^{2} (x) e^{x}$ .

$e^{x} \cdot 1 + e^{x} \cos^{2} (x) + \sin^{2} (x) e^{x}$

Etapa 5.3.3

Fatore $e^{x}$ de $\sin^{2} (x) e^{x}$ .

$e^{x} \cdot 1 + e^{x} \cos^{2} (x) + e^{x} \sin^{2} (x)$

Etapa 5.3.4

Fatore $e^{x}$ de $e^{x} \cdot 1 + e^{x} \cos^{2} (x)$ .

$e^{x} \cdot (1 + \cos^{2} (x)) + e^{x} \sin^{2} (x)$

Etapa 5.3.5

Fatore $e^{x}$ de $e^{x} \cdot (1 + \cos^{2} (x)) + e^{x} \sin^{2} (x)$ .

$e^{x} (1 + \cos^{2} (x) + \sin^{2} (x))$

Etapa 5.4

Reorganize os termos.

$e^{x} (1 + \sin^{2} (x) + \cos^{2} (x))$

Etapa 5.5

Aplique a identidade trigonométrica fundamental.

$e^{x} (1 + 1)$

Etapa 5.6

Some $1$ e $1$ .

$e^{x} \cdot 2$

Etapa 5.7

Mova $2$ para a esquerda de $e^{x}$ .

$2 e^{x}$