Trigonometrie Beispiele

$\csc (x) - \cot (x) = \frac{1}{\csc (x) + \cot (x)}$

Schritt 1

Beginne auf der rechten Seite.

$\frac{1}{\csc (x) + \cot (x)}$

Schritt 2

Wandle in Sinus und Kosinus um.

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Schritt 2.1

Wende die Kehrwertfunktion auf $\csc (x)$ an.

$\frac{1}{\frac{1}{\sin (x)} + \cot (x)}$

Schritt 2.2

Schreibe $\cot (x)$ mit Sinus und Kosinus mithilfe der Quotienten-Identitätsgleichung.

$\frac{1}{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}$

Schritt 3

Mutltipliziere $\frac{1}{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}$ mit $\frac{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}$ .

$\frac{1}{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}} \cdot \frac{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}$

Schritt 4

Kombinieren.

$\frac{1 (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)})}{(\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}) (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)})}$

Schritt 5

Mutltipliziere $\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}$ mit $1$ .

$\frac{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}{(\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}) (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)})}$

Schritt 6

Vereinfache Nenner.

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Schritt 6.1

Multipliziere $(\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}) (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)})$ aus unter Verwendung der FOIL-Methode.

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Schritt 6.1.1

Wende das Distributivgesetz an.

$\frac{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}{\frac{1}{\sin (x)} (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}) + \frac{\cos (x)}{\sin (x)} (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)})}$

Schritt 6.1.2

Wende das Distributivgesetz an.

$\frac{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}{\frac{1}{\sin (x)} \cdot \frac{1}{\sin (x)} + \frac{1}{\sin (x)} \cdot \frac{\cos (x)}{\sin (x)} + \frac{\cos (x)}{\sin (x)} (\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)})}$

Schritt 6.1.3

Wende das Distributivgesetz an.

Schritt 6.2

Vereinfache und fasse gleichartige Terme zusammen.

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Schritt 6.2.1

Vereinfache jeden Term.

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Schritt 6.2.1.1

Multipliziere $\frac{1}{\sin (x)} \cdot \frac{1}{\sin (x)}$ .

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Schritt 6.2.1.1.1

Mutltipliziere $\frac{1}{\sin (x)}$ mit $\frac{1}{\sin (x)}$ .

$\frac{\frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)}}{\frac{1}{\sin (x) \sin (x)} + \frac{1}{\sin (x)} \cdot \frac{\cos (x)}{\sin (x)} + \frac{\cos (x)}{\sin (x)} \cdot \frac{1}{\sin (x)} + \frac{\cos (x)}{\sin (x)} \cdot \frac{\cos (x)}{\sin (x)}}$

Schritt 6.2.1.1.2

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.1.3

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.1.4

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

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

Schritt 6.2.1.1.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.2

Multipliziere $\frac{1}{\sin (x)} \cdot \frac{\cos (x)}{\sin (x)}$ .

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Schritt 6.2.1.2.1

Mutltipliziere $\frac{1}{\sin (x)}$ mit $\frac{\cos (x)}{\sin (x)}$ .

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

Schritt 6.2.1.2.2

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.2.3

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.2.4

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

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

Schritt 6.2.1.2.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.3

Multipliziere $\frac{\cos (x)}{\sin (x)} \cdot \frac{1}{\sin (x)}$ .

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Schritt 6.2.1.3.1

Mutltipliziere $\frac{\cos (x)}{\sin (x)}$ mit $\frac{1}{\sin (x)}$ .

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

Schritt 6.2.1.3.2

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.3.3

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.3.4

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

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

Schritt 6.2.1.3.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.4

Multipliziere $\frac{\cos (x)}{\sin (x)} \cdot \frac{\cos (x)}{\sin (x)}$ .

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Schritt 6.2.1.4.1

Mutltipliziere $\frac{\cos (x)}{\sin (x)}$ mit $\frac{\cos (x)}{\sin (x)}$ .

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

Schritt 6.2.1.4.2

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

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

Schritt 6.2.1.4.3

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

Schritt 6.2.1.4.4

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

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

Schritt 6.2.1.4.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.4.6

Potenziere $\sin (x)$ mit $1$ .

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

Schritt 6.2.1.4.7

Potenziere $\sin (x)$ mit $1$ .

Schritt 6.2.1.4.8

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

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

Schritt 6.2.1.4.9

Addiere $1$ und $1$ .

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

Schritt 6.2.2

Vereinige die Zähler über dem gemeinsamen Nenner.

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

Schritt 6.3

Vereinige die Zähler über dem gemeinsamen Nenner.

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

Schritt 6.4

Addiere $\cos (x)$ und $\cos (x)$ .

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

Schritt 6.5

Faktorisiere unter Verwendung der binomischen Formeln.

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

Schritt 7

Wende den umgekehrten trigonometrischen Pythagoras an.

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

Schritt 8

Vereinfache.

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Schritt 8.1

Multipliziere den Zähler mit dem Kehrwert des Nenners.

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

Schritt 8.2

Vereinfache den Zähler.

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Schritt 8.2.1

Schreibe $1$ als $1^{2}$ um.

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

Schritt 8.2.2

Da beide Terme perfekte Quadrate sind, faktorisiere durch Anwendung der dritten binomischen Formel, $a^{2} - b^{2} = (a + b) (a - b)$ , mit $a = 1$ und $b = \cos (x)$ .

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

Schritt 8.3

Kürze die gemeinsamen Faktoren.

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Schritt 8.3.1

Faktorisiere $1 + \cos (x)$ aus ${(1 + \cos (x))}^{2}$ heraus.

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

Schritt 8.3.2

Kürze den gemeinsamen Faktor.

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

Schritt 8.3.3

Forme den Ausdruck um.

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

Schritt 8.4

Wende das Distributivgesetz an.

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

Schritt 8.5

Mutltipliziere $\frac{1}{\sin (x)}$ mit $\frac{1 - \cos (x)}{1 + \cos (x)}$ .

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

Schritt 8.6

Mutltipliziere $\frac{\cos (x)}{\sin (x)}$ mit $\frac{1 - \cos (x)}{1 + \cos (x)}$ .

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

Schritt 8.7

Vereinige die Zähler über dem gemeinsamen Nenner.

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

Schritt 8.8

Vereinfache jeden Term.

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Schritt 8.8.1

Wende das Distributivgesetz an.

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

Schritt 8.8.2

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

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

Schritt 8.8.3

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

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Schritt 8.8.3.1

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

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

Schritt 8.8.3.2

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

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

Schritt 8.8.3.3

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

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

Schritt 8.8.3.4

Addiere $1$ und $1$ .

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

Schritt 8.9

Addiere $- \cos (x)$ und $\cos (x)$ .

$\frac{1 + 0 - {\cos (x)}^{2}}{(1 + \cos (x)) \sin (x)}$

Schritt 8.10

Addiere $1$ und $0$ .

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

Schritt 8.11

Vereinfache den Zähler.

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Schritt 8.11.1

Schreibe $1$ als $1^{2}$ um.

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

Schritt 8.11.2

Da beide Terme perfekte Quadrate sind, faktorisiere durch Anwendung der dritten binomischen Formel, $a^{2} - b^{2} = (a + b) (a - b)$ , mit $a = 1$ und $b = \cos (x)$ .

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

Schritt 8.12

Kürze den gemeinsamen Faktor von $1 + \cos (x)$ .

$\frac{1 - \cos (x)}{\sin (x)}$

Schritt 9

Betrachte nun die linke Seite der Gleichung.

$\csc (x) - \cot (x)$

Schritt 10

Wandle in Sinus und Kosinus um.

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Schritt 10.1

Wende die Kehrwertfunktion auf $\csc (x)$ an.

$\frac{1}{\sin (x)} - \cot (x)$

Schritt 10.2

Schreibe $\cot (x)$ mit Sinus und Kosinus mithilfe der Quotienten-Identitätsgleichung.

$\frac{1}{\sin (x)} - \frac{\cos (x)}{\sin (x)}$

Schritt 11

Vereinige die Zähler über dem gemeinsamen Nenner.

$\frac{1 - \cos (x)}{\sin (x)}$

Schritt 12

Da gezeigt wurde, dass die beiden Seiten äquivalent sind, ist die Gleichung eine Identitätsgleichung.

$\csc (x) - \cot (x) = \frac{1}{\csc (x) + \cot (x)}$ ist eine Identitätsgleichung