Elementarmathematik Beispiele

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

Schritt 1

Beginne auf der linken Seite.

$\frac{1}{\sec (x) + \tan (x)}$

Schritt 2

Wandle in Sinus und Kosinus um.

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Schritt 2.1

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

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

Schritt 2.2

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

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

Schritt 3

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

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

Schritt 4

Kombinieren.

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

Schritt 5

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

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

Schritt 6

Vereinfache Nenner.

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Schritt 6.1

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

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Schritt 6.1.1

Wende das Distributivgesetz an.

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

Schritt 6.1.2

Wende das Distributivgesetz an.

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

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

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Schritt 6.2.1.1.1

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

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

Schritt 6.2.1.1.2

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

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

Schritt 6.2.1.1.3

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

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

Schritt 6.2.1.1.4

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

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

Schritt 6.2.1.1.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.2

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

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Schritt 6.2.1.2.1

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

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

Schritt 6.2.1.2.2

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

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

Schritt 6.2.1.2.3

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

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

Schritt 6.2.1.2.4

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

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

Schritt 6.2.1.2.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.3

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

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Schritt 6.2.1.3.1

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

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

Schritt 6.2.1.3.2

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

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

Schritt 6.2.1.3.3

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

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

Schritt 6.2.1.3.4

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

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

Schritt 6.2.1.3.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.4

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

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Schritt 6.2.1.4.1

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

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

Schritt 6.2.1.4.2

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

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

Schritt 6.2.1.4.3

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

Schritt 6.2.1.4.4

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

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

Schritt 6.2.1.4.5

Addiere $1$ und $1$ .

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

Schritt 6.2.1.4.6

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

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

Schritt 6.2.1.4.7

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

Schritt 6.2.1.4.8

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

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

Schritt 6.2.1.4.9

Addiere $1$ und $1$ .

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

Schritt 6.2.2

Vereinige die Zähler über dem gemeinsamen Nenner.

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

Schritt 6.3

Vereinige die Zähler über dem gemeinsamen Nenner.

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

Schritt 6.4

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

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

Schritt 6.5

Faktorisiere unter Verwendung der binomischen Formeln.

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

Schritt 7

Wende den umgekehrten trigonometrischen Pythagoras an.

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

Schritt 8

Vereinfache.

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Schritt 8.1

Multipliziere den Zähler mit dem Kehrwert des Nenners.

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

Schritt 8.2

Vereinfache den Zähler.

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Schritt 8.2.1

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

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

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 $b = \sin (x)$ .

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

Schritt 8.3

Kürze die gemeinsamen Faktoren.

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Schritt 8.3.1

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

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

Schritt 8.3.2

Kürze den gemeinsamen Faktor.

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

Schritt 8.3.3

Forme den Ausdruck um.

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

Schritt 8.4

Wende das Distributivgesetz an.

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

Schritt 8.5

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

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

Schritt 8.6

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

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

Schritt 8.7

Vereinige die Zähler über dem gemeinsamen Nenner.

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

Schritt 8.8

Vereinfache jeden Term.

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Schritt 8.8.1

Wende das Distributivgesetz an.

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

Schritt 8.8.2

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

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

Schritt 8.8.3

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

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Schritt 8.8.3.1

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

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

Schritt 8.8.3.2

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

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

Schritt 8.8.3.3

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

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

Schritt 8.8.3.4

Addiere $1$ und $1$ .

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

Schritt 8.9

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

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

Schritt 8.10

Addiere $1$ und $0$ .

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

Schritt 8.11

Vereinfache den Zähler.

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Schritt 8.11.1

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

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

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 $b = \sin (x)$ .

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

Schritt 8.12

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

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

Schritt 9

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

$\frac{1}{\sec (x) + \tan (x)} = \frac{1 - \sin (x)}{\cos (x)}$ ist eine Identitätsgleichung