Precálculo Ejemplos

$\frac{\sin (a)}{1 - \cot (a)} - \frac{\cos (a)}{\tan (a) - 1}$

Paso 1

Simplifica cada término.

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Paso 1.1

Reescribe $\cot (a)$ en términos de senos y cosenos.

$\frac{\sin (a)}{1 - \frac{\cos (a)}{\sin (a)}} - \frac{\cos (a)}{\tan (a) - 1}$

Paso 1.2

Reescribe $\tan (a)$ en términos de senos y cosenos.

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

Paso 2

Para escribir $\frac{\sin (a)}{1 - \frac{\cos (a)}{\sin (a)}}$ como una fracción con un denominador común, multiplica por $\frac{\frac{\sin (a)}{\cos (a)} - 1}{\frac{\sin (a)}{\cos (a)} - 1}$ .

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

Paso 3

Para escribir $- \frac{\cos (a)}{\frac{\sin (a)}{\cos (a)} - 1}$ como una fracción con un denominador común, multiplica por $\frac{1 - \frac{\cos (a)}{\sin (a)}}{1 - \frac{\cos (a)}{\sin (a)}}$ .

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

Paso 4

Escribe cada expresión con un denominador común de $(1 - \frac{\cos (a)}{\sin (a)}) (\frac{\sin (a)}{\cos (a)} - 1)$ , mediante la multiplicación de cada uno por un factor adecuado de $1$ .

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Paso 4.1

Multiplica $\frac{\sin (a)}{1 - \frac{\cos (a)}{\sin (a)}}$ por $\frac{\frac{\sin (a)}{\cos (a)} - 1}{\frac{\sin (a)}{\cos (a)} - 1}$ .

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

Paso 4.2

Multiplica $\frac{\cos (a)}{\frac{\sin (a)}{\cos (a)} - 1}$ por $\frac{1 - \frac{\cos (a)}{\sin (a)}}{1 - \frac{\cos (a)}{\sin (a)}}$ .

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

Paso 4.3

Reordena los factores de $(\frac{\sin (a)}{\cos (a)} - 1) (1 - \frac{\cos (a)}{\sin (a)})$ .

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

Paso 5

Combina los numeradores sobre el denominador común.

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

Paso 6

Simplifica el numerador.

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Paso 6.1

Aplica la propiedad distributiva.

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

Paso 6.2

Multiplica $\sin (a) \frac{\sin (a)}{\cos (a)}$ .

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Paso 6.2.1

Combina $\sin (a)$ y $\frac{\sin (a)}{\cos (a)}$ .

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

Paso 6.2.2

Eleva $\sin (a)$ a la potencia de $1$ .

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

Paso 6.2.3

Eleva $\sin (a)$ a la potencia de $1$ .

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

Paso 6.2.4

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

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

Paso 6.2.5

Suma $1$ y $1$ .

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

Paso 6.3

Mueve $- 1$ a la izquierda de $\sin (a)$ .

$\frac{\frac{\sin^{2} (a)}{\cos (a)} - 1 \cdot \sin (a) - \cos (a) (1 - \frac{\cos (a)}{\sin (a)})}{(1 - \frac{\cos (a)}{\sin (a)}) (\frac{\sin (a)}{\cos (a)} - 1)}$

Paso 6.4

Reescribe $- 1 \sin (a)$ como $- \sin (a)$ .

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

Paso 6.5

Aplica la propiedad distributiva.

$\frac{\frac{\sin^{2} (a)}{\cos (a)} - \sin (a) - \cos (a) \cdot 1 - \cos (a) (- \frac{\cos (a)}{\sin (a)})}{(1 - \frac{\cos (a)}{\sin (a)}) (\frac{\sin (a)}{\cos (a)} - 1)}$

Paso 6.6

Multiplica $- 1$ por $1$ .

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

Paso 6.7

Multiplica $- \cos (a) (- \frac{\cos (a)}{\sin (a)})$ .

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Paso 6.7.1

Multiplica $- 1$ por $- 1$ .

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

Paso 6.7.2

Multiplica $\cos (a)$ por $1$ .

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

Paso 6.7.3

Combina $\cos (a)$ y $\frac{\cos (a)}{\sin (a)}$ .

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

Paso 6.7.4

Eleva $\cos (a)$ a la potencia de $1$ .

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

Paso 6.7.5

Eleva $\cos (a)$ a la potencia de $1$ .

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

Paso 6.7.6

Usa la regla de la potencia $a^{m} a^{n} = a^{m + n}$ para combinar exponentes.

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

Paso 6.7.7

Suma $1$ y $1$ .

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

Paso 7

Simplifica cada término.

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Paso 7.1

Factoriza $\sin (a)$ de $\sin^{2} (a)$ .

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

Paso 7.2

Separa las fracciones.

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

Paso 7.3

Convierte de $\frac{\sin (a)}{\cos (a)}$ a $\tan (a)$ .

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

Paso 7.4

Divide $\sin (a)$ por $1$ .

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

Paso 7.5

Factoriza $\cos (a)$ de $\cos^{2} (a)$ .

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

Paso 7.6

Separa las fracciones.

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

Paso 7.7

Convierte de $\frac{\cos (a)}{\sin (a)}$ a $\cot (a)$ .

$\frac{\sin (a) \tan (a) - \sin (a) - \cos (a) + \frac{\cos (a)}{1} \cot (a)}{(1 - \frac{\cos (a)}{\sin (a)}) (\frac{\sin (a)}{\cos (a)} - 1)}$

Paso 7.8

Divide $\cos (a)$ por $1$ .

$\frac{\sin (a) \tan (a) - \sin (a) - \cos (a) + \cos (a) \cot (a)}{(1 - \frac{\cos (a)}{\sin (a)}) (\frac{\sin (a)}{\cos (a)} - 1)}$

Paso 8

Simplifica el denominador.

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Paso 8.1

Convierte de $\frac{\cos (a)}{\sin (a)}$ a $\cot (a)$ .

$\frac{\sin (a) \tan (a) - \sin (a) - \cos (a) + \cos (a) \cot (a)}{(1 - \cot (a)) (\frac{\sin (a)}{\cos (a)} - 1)}$

Paso 8.2

Convierte de $\frac{\sin (a)}{\cos (a)}$ a $\tan (a)$ .

$\frac{\sin (a) \tan (a) - \sin (a) - \cos (a) + \cos (a) \cot (a)}{(1 - \cot (a)) (\tan (a) - 1)}$