Cálculo Ejemplos

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

Paso 1

Como $2$ es constante con respecto a $x$ , la derivada de $\frac{2 x \sin (x)}{1 + \cos (x)}$ con respecto a $x$ es $2 \frac{d}{d x} [\frac{x \sin (x)}{1 + \cos (x)}]$ .

$2 \frac{d}{d x} [\frac{x \sin (x)}{1 + \cos (x)}]$

Paso 2

Diferencia con la regla del cociente, que establece que $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ es $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ donde $f (x) = x \sin (x)$ y $g (x) = 1 + \cos (x)$ .

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

Paso 3

Diferencia con la regla del producto, que establece que $\frac{d}{d x} [f (x) g (x)]$ es $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ donde $f (x) = x$ y $g (x) = \sin (x)$ .

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

Paso 4

La derivada de $\sin (x)$ con respecto a $x$ es $\cos (x)$ .

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

Paso 5

Diferencia.

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Paso 5.1

Diferencia con la regla de la potencia, que establece que $\frac{d}{d x} [x^{n}]$ es $n x^{n - 1}$ donde $n = 1$ .

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

Paso 5.2

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

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

Paso 5.3

Según la regla de la suma, la derivada de $1 + \cos (x)$ con respecto a $x$ es $\frac{d}{d x} [1] + \frac{d}{d x} [\cos (x)]$ .

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

Paso 5.4

Como $1$ es constante con respecto a $x$ , la derivada de $1$ con respecto a $x$ es $0$ .

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

Paso 5.5

Suma $0$ y $\frac{d}{d x} [\cos (x)]$ .

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

Paso 6

La derivada de $\cos (x)$ con respecto a $x$ es $- \sin (x)$ .

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

Paso 7

Multiplica.

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Paso 7.1

Multiplica $- 1$ por $- 1$ .

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

Paso 7.2

Multiplica $x$ por $1$ .

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

Paso 8

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

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

Paso 9

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

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

Paso 10

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

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

Paso 11

Suma $1$ y $1$ .

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

Paso 12

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

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

Paso 13

Simplifica.

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Paso 13.1

Aplica la propiedad distributiva.

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

Paso 13.2

Simplifica el numerador.

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Paso 13.2.1

Simplifica cada término.

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Paso 13.2.1.1

Expande $(1 + \cos (x)) (x \cos (x) + \sin (x))$ con el método PEIU (primero, exterior, interior, ultimo).

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Paso 13.2.1.1.1

Aplica la propiedad distributiva.

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

Paso 13.2.1.1.2

Aplica la propiedad distributiva.

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

Paso 13.2.1.1.3

Aplica la propiedad distributiva.

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

Paso 13.2.1.2

Simplifica cada término.

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Paso 13.2.1.2.1

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

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

Paso 13.2.1.2.2

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

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

Paso 13.2.1.2.3

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

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Paso 13.2.1.2.3.1

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

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

Paso 13.2.1.2.3.2

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

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

Paso 13.2.1.2.3.3

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

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

Paso 13.2.1.2.3.4

Suma $1$ y $1$ .

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

Paso 13.2.1.3

Aplica la propiedad distributiva.

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

Paso 13.2.1.4

Simplifica.

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Paso 13.2.1.4.1

Reordena $2 \cos (x)$ y $\sin (x)$ .

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

Paso 13.2.1.4.2

Reordena $\sin (x)$ y $2$ .

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

Paso 13.2.1.4.3

Aplica la razón del ángulo doble sinusoidal.

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

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

Paso 13.2.2

Mueve $2 x \sin^{2} (x)$ .

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

Paso 13.2.3

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

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

Paso 13.2.4

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

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

Paso 13.2.5

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

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

Paso 13.2.6

Reorganiza los términos.

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

Paso 13.2.7

Aplica la identidad pitagórica.

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

Paso 13.2.8

Multiplica $2$ por $1$ .

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

Paso 13.3

Reordena los términos.

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