Elementarmathematik Beispiele

$[\begin{array}{c} - 1 & \cos (c) & \cos (b) \\ \cos (c) & - 1 & \cos (a) \\ \cos (b) & \cos (a) & - 1 \end{array}]$

Schritt 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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Schritt 1.1

Consider the corresponding sign chart.

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

Schritt 1.2

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

Schritt 1.3

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

$| \begin{array}{c} - 1 & \cos (a) \\ \cos (a) & - 1 \end{array} |$

Schritt 1.4

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

$- 1 | \begin{array}{c} - 1 & \cos (a) \\ \cos (a) & - 1 \end{array} |$

Schritt 1.5

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

$| \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} |$

Schritt 1.6

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

$- \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} |$

Schritt 1.7

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

$| \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 1.8

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

$\cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 1.9

Add the terms together.

$- 1 | \begin{array}{c} - 1 & \cos (a) \\ \cos (a) & - 1 \end{array} | - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2

Berechne $| \begin{array}{c} - 1 & \cos (a) \\ \cos (a) & - 1 \end{array} |$ .

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Schritt 2.1

Die Determinante einer $2 \times 2$ -Matrix kann mithilfe der Formel $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ bestimmt werden.

$- 1 (- - 1 - \cos (a) \cos (a)) - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2.2

Vereinfache die Determinante.

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Schritt 2.2.1

Vereinfache jeden Term.

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Schritt 2.2.1.1

Mutltipliziere $- 1$ mit $- 1$ .

$- 1 (1 - \cos (a) \cos (a)) - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2.2.1.2

Multipliziere $- \cos (a) \cos (a)$ .

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Schritt 2.2.1.2.1

Potenziere $\cos (a)$ mit $1$ .

$- 1 (1 - (\cos^{1} (a) \cos (a))) - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2.2.1.2.2

Potenziere $\cos (a)$ mit $1$ .

$- 1 (1 - (\cos^{1} (a) \cos^{1} (a))) - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2.2.1.2.3

Wende die Exponentenregel $a^{m} a^{n} = a^{m + n}$ an, um die Exponenten zu kombinieren.

$- 1 (1 - {\cos (a)}^{1 + 1}) - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2.2.1.2.4

Addiere $1$ und $1$ .

$- 1 (1 - \cos^{2} (a)) - \cos (c) | \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} | + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 2.2.2

Wende den trigonometrischen Pythagoras an.

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

Schritt 3

Berechne $| \begin{array}{c} \cos (c) & \cos (a) \\ \cos (b) & - 1 \end{array} |$ .

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Schritt 3.1

Die Determinante einer $2 \times 2$ -Matrix kann mithilfe der Formel $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ bestimmt werden.

$- 1 \sin^{2} (a) - \cos (c) (\cos (c) \cdot - 1 - \cos (b) \cos (a)) + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 3.2

Vereinfache jeden Term.

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Schritt 3.2.1

Bringe $- 1$ auf die linke Seite von $\cos (c)$ .

$- 1 \sin^{2} (a) - \cos (c) (- 1 \cdot \cos (c) - \cos (b) \cos (a)) + \cos (b) | \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$

Schritt 3.2.2

Schreibe $- 1 \cos (c)$ als $- \cos (c)$ um.

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

Schritt 4

Berechne $| \begin{array}{c} \cos (c) & - 1 \\ \cos (b) & \cos (a) \end{array} |$ .

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Schritt 4.1

Die Determinante einer $2 \times 2$ -Matrix kann mithilfe der Formel $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ bestimmt werden.

$- 1 \sin^{2} (a) - \cos (c) (- \cos (c) - \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) - \cos (b) \cdot - 1)$

Schritt 4.2

Multipliziere $- \cos (b) \cdot - 1$ .

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Schritt 4.2.1

Mutltipliziere $- 1$ mit $- 1$ .

$- 1 \sin^{2} (a) - \cos (c) (- \cos (c) - \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + 1 \cos (b))$

Schritt 4.2.2

Mutltipliziere $\cos (b)$ mit $1$ .

$- 1 \sin^{2} (a) - \cos (c) (- \cos (c) - \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5

Vereinfache die Determinante.

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Schritt 5.1

Vereinfache jeden Term.

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Schritt 5.1.1

Schreibe $- 1 \sin^{2} (a)$ als $- \sin^{2} (a)$ um.

$- \sin^{2} (a) - \cos (c) (- \cos (c) - \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.2

Wende das Distributivgesetz an.

$- \sin^{2} (a) - \cos (c) (- \cos (c)) - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.3

Multipliziere $- \cos (c) (- \cos (c))$ .

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Schritt 5.1.3.1

Mutltipliziere $- 1$ mit $- 1$ .

$- \sin^{2} (a) + 1 \cos (c) \cos (c) - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.3.2

Mutltipliziere $\cos (c)$ mit $1$ .

$- \sin^{2} (a) + \cos (c) \cos (c) - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.3.3

Potenziere $\cos (c)$ mit $1$ .

$- \sin^{2} (a) + \cos^{1} (c) \cos (c) - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.3.4

Potenziere $\cos (c)$ mit $1$ .

$- \sin^{2} (a) + \cos^{1} (c) \cos^{1} (c) - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.3.5

Wende die Exponentenregel $a^{m} a^{n} = a^{m + n}$ an, um die Exponenten zu kombinieren.

$- \sin^{2} (a) + {\cos (c)}^{1 + 1} - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.3.6

Addiere $1$ und $1$ .

$- \sin^{2} (a) + \cos^{2} (c) - \cos (c) (- \cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.4

Multipliziere $- \cos (c) (- \cos (b) \cos (a))$ .

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Schritt 5.1.4.1

Mutltipliziere $- 1$ mit $- 1$ .

$- \sin^{2} (a) + \cos^{2} (c) + 1 \cos (c) (\cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.4.2

Mutltipliziere $\cos (c)$ mit $1$ .

$- \sin^{2} (a) + \cos^{2} (c) + \cos (c) (\cos (b) \cos (a)) + \cos (b) (\cos (c) \cos (a) + \cos (b))$

Schritt 5.1.5

Wende das Distributivgesetz an.

$- \sin^{2} (a) + \cos^{2} (c) + \cos (c) \cos (b) \cos (a) + \cos (b) (\cos (c) \cos (a)) + \cos (b) \cos (b)$

Schritt 5.1.6

Multipliziere $\cos (b) \cos (b)$ .

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Schritt 5.1.6.1

Potenziere $\cos (b)$ mit $1$ .

$- \sin^{2} (a) + \cos^{2} (c) + \cos (c) \cos (b) \cos (a) + \cos (b) \cos (c) \cos (a) + \cos^{1} (b) \cos (b)$

Schritt 5.1.6.2

Potenziere $\cos (b)$ mit $1$ .

$- \sin^{2} (a) + \cos^{2} (c) + \cos (c) \cos (b) \cos (a) + \cos (b) \cos (c) \cos (a) + \cos^{1} (b) \cos^{1} (b)$

Schritt 5.1.6.3

Wende die Exponentenregel $a^{m} a^{n} = a^{m + n}$ an, um die Exponenten zu kombinieren.

$- \sin^{2} (a) + \cos^{2} (c) + \cos (c) \cos (b) \cos (a) + \cos (b) \cos (c) \cos (a) + {\cos (b)}^{1 + 1}$

Schritt 5.1.6.4

Addiere $1$ und $1$ .

$- \sin^{2} (a) + \cos^{2} (c) + \cos (c) \cos (b) \cos (a) + \cos (b) \cos (c) \cos (a) + \cos^{2} (b)$

Schritt 5.2

Ordne die Faktoren in den Termen $\cos (c) \cos (b) \cos (a)$ und $\cos (b) \cos (c) \cos (a)$ neu an.

$- \sin^{2} (a) + \cos^{2} (c) + \cos (a) \cos (b) \cos (c) + \cos (a) \cos (b) \cos (c) + \cos^{2} (b)$

Schritt 5.3

Addiere $\cos (a) \cos (b) \cos (c)$ und $\cos (a) \cos (b) \cos (c)$ .

$- \sin^{2} (a) + \cos^{2} (c) + 2 \cos (a) \cos (b) \cos (c) + \cos^{2} (b)$