Precálculo Ejemplos

$\frac{\cot (2 x) - \tan (2 x)}{\sin (2 x) + \cos (2 x)}$

Paso 1

Simplifica el numerador.

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Paso 1.1

Reescribe $\cot (2 x)$ en términos de senos y cosenos.

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

Paso 1.2

Reescribe $\tan (2 x)$ en términos de senos y cosenos.

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

Paso 2

Multiply the numerator and denominator of the fraction by $\sin (2 x) \cos (2 x)$ .

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Paso 2.1

Multiplica $\frac{\frac{\cos (2 x)}{\sin (2 x)} - \frac{\sin (2 x)}{\cos (2 x)}}{\sin (2 x) + \cos (2 x)}$ por $\frac{\sin (2 x) \cos (2 x)}{\sin (2 x) \cos (2 x)}$ .

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

Paso 2.2

Combinar.

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

Paso 3

Aplica la propiedad distributiva.

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

Paso 4

Simplifica mediante la cancelación.

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Paso 4.1

Cancela el factor común de $\sin (2 x)$ .

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Paso 4.1.1

Factoriza $\sin (2 x)$ de $\sin (2 x) \cos (2 x)$ .

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

Paso 4.1.2

Cancela el factor común.

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

Paso 4.1.3

Reescribe la expresión.

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

Paso 4.2

Eleva $\cos (2 x)$ a la potencia de $1$ .

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

Paso 4.3

Eleva $\cos (2 x)$ a la potencia de $1$ .

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

Paso 4.4

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

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

Paso 4.5

Suma $1$ y $1$ .

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

Paso 4.6

Cancela el factor común de $\cos (2 x)$ .

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Paso 4.6.1

Mueve el signo menos inicial en $- \frac{\sin (2 x)}{\cos (2 x)}$ al numerador.

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

Paso 4.6.2

Factoriza $\cos (2 x)$ de $\sin (2 x) \cos (2 x)$ .

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

Paso 4.6.3

Cancela el factor común.

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

Paso 4.6.4

Reescribe la expresión.

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

Paso 4.7

Eleva $\sin (2 x)$ a la potencia de $1$ .

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

Paso 4.8

Eleva $\sin (2 x)$ a la potencia de $1$ .

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

Paso 4.9

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

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

Paso 4.10

Suma $1$ y $1$ .

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

Paso 5

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 $a = \cos (2 x)$ y $b = \sin (2 x)$ .

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

Paso 6

Simplifica el denominador.

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Paso 6.1

Multiplica $\sin (2 x) \cos (2 x) \sin (2 x)$ .

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Paso 6.1.1

Eleva $\sin (2 x)$ a la potencia de $1$ .

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

Paso 6.1.2

Eleva $\sin (2 x)$ a la potencia de $1$ .

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

Paso 6.1.3

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

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

Paso 6.1.4

Suma $1$ y $1$ .

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

Paso 6.2

Multiplica $\sin (2 x) \cos (2 x) \cos (2 x)$ .

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Paso 6.2.1

Eleva $\cos (2 x)$ a la potencia de $1$ .

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

Paso 6.2.2

Eleva $\cos (2 x)$ a la potencia de $1$ .

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

Paso 6.2.3

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

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

Paso 6.2.4

Suma $1$ y $1$ .

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

Paso 6.3

Factoriza $\sin (2 x) \cos (2 x)$ de $\sin^{2} (2 x) \cos (2 x) + \sin (2 x) \cos^{2} (2 x)$ .

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Paso 6.3.1

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

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

Paso 6.3.2

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

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

Paso 6.3.3

Factoriza $\sin (2 x) \cos (2 x)$ de $\sin (2 x) \cos (2 x) (\sin (2 x)) + \sin (2 x) \cos (2 x) (\cos (2 x))$ .

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