Precálculo Ejemplos

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

Paso 1

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

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

Paso 2

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

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

Paso 3

Escribe cada expresión con un denominador común de $(\sin (x) + \sin (y)) (\cos (x) + \cos (y))$ , mediante la multiplicación de cada uno por un factor adecuado de $1$ .

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Paso 3.1

Multiplica $\frac{\cos (x) - \cos (y)}{\sin (x) + \sin (y)}$ por $\frac{\cos (x) + \cos (y)}{\cos (x) + \cos (y)}$ .

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

Paso 3.2

Multiplica $\frac{\sin (x) - \sin (y)}{\cos (x) + \cos (y)}$ por $\frac{\sin (x) + \sin (y)}{\sin (x) + \sin (y)}$ .

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

Paso 3.3

Reordena los factores de $(\sin (x) + \sin (y)) (\cos (x) + \cos (y))$ .

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

Paso 4

Combina los numeradores sobre el denominador común.

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

Paso 5

Simplifica el numerador.

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Paso 5.1

Expande $(\cos (x) - \cos (y)) (\cos (x) + \cos (y))$ con el método PEIU (primero, exterior, interior, ultimo).

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Paso 5.1.1

Aplica la propiedad distributiva.

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

Paso 5.1.2

Aplica la propiedad distributiva.

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

Paso 5.1.3

Aplica la propiedad distributiva.

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

Paso 5.2

Combina los términos opuestos en $\cos (x) \cos (x) + \cos (x) \cos (y) - \cos (y) \cos (x) - \cos (y) \cos (y)$ .

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Paso 5.2.1

Reordena los factores en los términos $\cos (x) \cos (y)$ y $- \cos (y) \cos (x)$ .

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

Paso 5.2.2

Resta $\cos (x) \cos (y)$ de $\cos (x) \cos (y)$ .

$\frac{\cos (x) \cos (x) + 0 - \cos (y) \cos (y) + (\sin (x) - \sin (y)) (\sin (x) + \sin (y))}{(\cos (x) + \cos (y)) (\sin (x) + \sin (y))}$

Paso 5.2.3

Suma $\cos (x) \cos (x)$ y $0$ .

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

Paso 5.3

Simplifica cada término.

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Paso 5.3.1

Multiplica $\cos (x) \cos (x)$ .

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Paso 5.3.1.1

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

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

Paso 5.3.1.2

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

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

Paso 5.3.1.3

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

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

Paso 5.3.1.4

Suma $1$ y $1$ .

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

Paso 5.3.2

Multiplica $- \cos (y) \cos (y)$ .

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Paso 5.3.2.1

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

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

Paso 5.3.2.2

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

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

Paso 5.3.2.3

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

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

Paso 5.3.2.4

Suma $1$ y $1$ .

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

Paso 5.4

Expande $(\sin (x) - \sin (y)) (\sin (x) + \sin (y))$ con el método PEIU (primero, exterior, interior, ultimo).

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Paso 5.4.1

Aplica la propiedad distributiva.

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

Paso 5.4.2

Aplica la propiedad distributiva.

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

Paso 5.4.3

Aplica la propiedad distributiva.

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

Paso 5.5

Combina los términos opuestos en $\sin (x) \sin (x) + \sin (x) \sin (y) - \sin (y) \sin (x) - \sin (y) \sin (y)$ .

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Paso 5.5.1

Reordena los factores en los términos $\sin (x) \sin (y)$ y $- \sin (y) \sin (x)$ .

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

Paso 5.5.2

Resta $\sin (x) \sin (y)$ de $\sin (x) \sin (y)$ .

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

Paso 5.5.3

Suma $\sin (x) \sin (x)$ y $0$ .

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

Paso 5.6

Simplifica cada término.

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Paso 5.6.1

Multiplica $\sin (x) \sin (x)$ .

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Paso 5.6.1.1

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

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

Paso 5.6.1.2

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

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

Paso 5.6.1.3

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

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

Paso 5.6.1.4

Suma $1$ y $1$ .

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

Paso 5.6.2

Multiplica $- \sin (y) \sin (y)$ .

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Paso 5.6.2.1

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

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

Paso 5.6.2.2

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

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

Paso 5.6.2.3

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

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

Paso 5.6.2.4

Suma $1$ y $1$ .

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

Paso 5.7

Reescribe $\cos^{2} (x) - \cos^{2} (y) + \sin^{2} (x) - \sin^{2} (y)$ en forma factorizada.

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Paso 5.7.1

Reagrupa los términos.

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

Paso 5.7.2

Reorganiza los términos.

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

Paso 5.7.3

Aplica la identidad pitagórica.

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

Paso 5.7.4

Reescribe $1 - \sin^{2} (y)$ en forma factorizada.

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Paso 5.7.4.1

Reescribe $1$ como $1^{2}$ .

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

Paso 5.7.4.2

Dado que ambos términos son cuadrados perfectos, factoriza con la fórmula de la diferencia de cuadrados, $a^{2} - b^{2} = (a + b) (a - b)$ , donde $a = 1$ y $b = \sin (y)$ .

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

Paso 5.7.5

Factoriza $- 1$ de $- \cos^{2} (y) + (1 + \sin (y)) (1 - \sin (y))$ .

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Paso 5.7.5.1

Factoriza $- 1$ de $- \cos^{2} (y)$ .

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

Paso 5.7.5.2

Factoriza $- 1$ de $(1 + \sin (y)) (1 - \sin (y))$ .

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

Paso 5.7.5.3

Factoriza $- 1$ de $- (\cos^{2} (y)) - ((- 1 - \sin (y)) (1 - \sin (y)))$ .

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

Paso 5.7.6

Expande $(- 1 - \sin (y)) (1 - \sin (y))$ con el método PEIU (primero, exterior, interior, ultimo).

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Paso 5.7.6.1

Aplica la propiedad distributiva.

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

Paso 5.7.6.2

Aplica la propiedad distributiva.

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

Paso 5.7.6.3

Aplica la propiedad distributiva.

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

Paso 5.7.7

Simplifica y combina los términos similares.

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Paso 5.7.7.1

Simplifica cada término.

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Paso 5.7.7.1.1

Multiplica $- 1$ por $1$ .

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

Paso 5.7.7.1.2

Multiplica $- 1 (- \sin (y))$ .

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Paso 5.7.7.1.2.1

Multiplica $- 1$ por $- 1$ .

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

Paso 5.7.7.1.2.2

Multiplica $\sin (y)$ por $1$ .

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

Paso 5.7.7.1.3

Multiplica $- 1$ por $1$ .

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

Paso 5.7.7.1.4

Multiplica $- \sin (y) (- \sin (y))$ .

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Paso 5.7.7.1.4.1

Multiplica $- 1$ por $- 1$ .

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

Paso 5.7.7.1.4.2

Multiplica $\sin (y)$ por $1$ .

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

Paso 5.7.7.1.4.3

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

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

Paso 5.7.7.1.4.4

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

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

Paso 5.7.7.1.4.5

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

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

Paso 5.7.7.1.4.6

Suma $1$ y $1$ .

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

Paso 5.7.7.2

Resta $\sin (y)$ de $\sin (y)$ .

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

Paso 5.7.7.3

Suma $- 1$ y $0$ .

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

Paso 5.7.8

Reescribe $- 1$ como $- 1 (1)$ .

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

Paso 5.7.9

Factoriza $- 1$ de $\sin^{2} (y)$ .

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

Paso 5.7.10

Factoriza $- 1$ de $- 1 (1) - 1 (- \sin^{2} (y))$ .

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

Paso 5.7.11

Reescribe $- 1 (1 - \sin^{2} (y))$ como $- (1 - \sin^{2} (y))$ .

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

Paso 5.7.12

Aplica la identidad pitagórica.

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

Paso 5.7.13

Resta $\cos^{2} (y)$ de $\cos^{2} (y)$ .

$\frac{- 0}{(\cos (x) + \cos (y)) (\sin (x) + \sin (y))}$

Paso 6

Multiplica por cero.

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Paso 6.1

Multiplica $- 1$ por $0$ .

$\frac{0}{(\cos (x) + \cos (y)) (\sin (x) + \sin (y))}$

Paso 6.2

Divide $0$ por $(\cos (x) + \cos (y)) (\sin (x) + \sin (y))$ .

$0$