Cálculo Ejemplos

$y = \frac{\sin (3 x^{2})}{\log (\cos (3 x))}$

Paso 1

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 $f (x) = \sin (3 x^{2})$ y $g (x) = \log (\cos (3 x))$ .

$\frac{\log (\cos (3 x)) \frac{d}{d x} [\sin (3 x^{2})] - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 2

Diferencia con la regla de la cadena, que establece que $\frac{d}{d x} [f (g (x))]$ es $f' (g (x)) g' (x)$ donde $f (x) = \sin (x)$ y $g (x) = 3 x^{2}$ .

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Paso 2.1

Para aplicar la regla de la cadena, establece $u_{1}$ como $3 x^{2}$ .

$\frac{\log (\cos (3 x)) (\frac{d}{d u_{1}} [\sin (u_{1})] \frac{d}{d x} [3 x^{2}]) - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 2.2

La derivada de $\sin (u_{1})$ con respecto a $u_{1}$ es $\cos (u_{1})$ .

$\frac{\log (\cos (3 x)) (\cos (u_{1}) \frac{d}{d x} [3 x^{2}]) - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 2.3

Reemplaza todos los casos de $u_{1}$ con $3 x^{2}$ .

$\frac{\log (\cos (3 x)) (\cos (3 x^{2}) \frac{d}{d x} [3 x^{2}]) - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 3

Diferencia.

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Paso 3.1

Como $3$ es constante con respecto a $x$ , la derivada de $3 x^{2}$ con respecto a $x$ es $3 \frac{d}{d x} [x^{2}]$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (3 \frac{d}{d x} [x^{2}]) - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 3.2

Diferencia con la regla de la potencia, que establece que $\frac{d}{d x} [x^{n}]$ es $n x^{n - 1}$ donde $n = 2$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (3 (2 x)) - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 3.3

Multiplica $2$ por $3$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \sin (3 x^{2}) \frac{d}{d x} [\log (\cos (3 x))]}{\log^{2} (\cos (3 x))}$

Paso 4

Diferencia con la regla de la cadena, que establece que $\frac{d}{d x} [f (g (x))]$ es $f' (g (x)) g' (x)$ donde $f (x) = \log (x)$ y $g (x) = \cos (3 x)$ .

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Paso 4.1

Para aplicar la regla de la cadena, establece $u_{2}$ como $\cos (3 x)$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \sin (3 x^{2}) (\frac{d}{d u_{2}} [\log (u_{2})] \frac{d}{d x} [\cos (3 x)])}{\log^{2} (\cos (3 x))}$

Paso 4.2

La derivada de $\log (u_{2})$ con respecto a $u_{2}$ es $\frac{1}{u_{2} \ln (10)}$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \sin (3 x^{2}) (\frac{1}{u_{2} \ln (10)} \frac{d}{d x} [\cos (3 x)])}{\log^{2} (\cos (3 x))}$

Paso 4.3

Reemplaza todos los casos de $u_{2}$ con $\cos (3 x)$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \sin (3 x^{2}) (\frac{1}{\cos (3 x) \ln (10)} \frac{d}{d x} [\cos (3 x)])}{\log^{2} (\cos (3 x))}$

Paso 5

Combina $\frac{1}{\cos (3 x) \ln (10)}$ y $\sin (3 x^{2})$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)} \frac{d}{d x} [\cos (3 x)]}{\log^{2} (\cos (3 x))}$

Paso 6

Diferencia con la regla de la cadena, que establece que $\frac{d}{d x} [f (g (x))]$ es $f' (g (x)) g' (x)$ donde $f (x) = \cos (x)$ y $g (x) = 3 x$ .

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Paso 6.1

Para aplicar la regla de la cadena, establece $u_{3}$ como $3 x$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)} (\frac{d}{d u_{3}} [\cos (u_{3})] \frac{d}{d x} [3 x])}{\log^{2} (\cos (3 x))}$

Paso 6.2

La derivada de $\cos (u_{3})$ con respecto a $u_{3}$ es $- \sin (u_{3})$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)} (- \sin (u_{3}) \frac{d}{d x} [3 x])}{\log^{2} (\cos (3 x))}$

Paso 6.3

Reemplaza todos los casos de $u_{3}$ con $3 x$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) - \frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)} (- \sin (3 x) \frac{d}{d x} [3 x])}{\log^{2} (\cos (3 x))}$

Paso 7

Diferencia.

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Paso 7.1

Multiplica $- 1$ por $- 1$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + 1 \frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)} (\sin (3 x) \frac{d}{d x} [3 x])}{\log^{2} (\cos (3 x))}$

Paso 7.2

Combina fracciones.

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Paso 7.2.1

Multiplica $\frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)}$ por $1$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)} (\sin (3 x) \frac{d}{d x} [3 x])}{\log^{2} (\cos (3 x))}$

Paso 7.2.2

Combina $\sin (3 x)$ y $\frac{\sin (3 x^{2})}{\cos (3 x) \ln (10)}$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{\sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)} \frac{d}{d x} [3 x]}{\log^{2} (\cos (3 x))}$

Paso 7.3

Como $3$ es constante con respecto a $x$ , la derivada de $3 x$ con respecto a $x$ es $3 \frac{d}{d x} [x]$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{\sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)} (3 \frac{d}{d x} [x])}{\log^{2} (\cos (3 x))}$

Paso 7.4

Combina $3$ y $\frac{\sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{3 (\sin (3 x) \sin (3 x^{2}))}{\cos (3 x) \ln (10)} \frac{d}{d x} [x]}{\log^{2} (\cos (3 x))}$

Paso 7.5

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

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)} \cdot 1}{\log^{2} (\cos (3 x))}$

Paso 7.6

Multiplica $\frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}$ por $1$ .

$\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}}{\log^{2} (\cos (3 x))}$

Paso 8

Multiplica $\frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}}{\log^{2} (\cos (3 x))}$ por $\frac{\cos (3 x) \ln (10)}{\cos (3 x) \ln (10)}$ .

$\frac{\cos (3 x) \ln (10)}{\cos (3 x) \ln (10)} \cdot \frac{\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}}{\log^{2} (\cos (3 x))}$

Paso 9

Combinar.

$\frac{\cos (3 x) \ln (10) (\log (\cos (3 x)) \cos (3 x^{2}) (6 x) + \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)})}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 10

Aplica la propiedad distributiva.

$\frac{\cos (3 x) \ln (10) (\log (\cos (3 x)) \cos (3 x^{2}) (6 x)) + \cos (3 x) \ln (10) \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 11

Cancela el factor común de $\cos (3 x) \ln (10)$ .

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Paso 11.1

Cancela el factor común.

$\frac{\cos (3 x) \ln (10) (\log (\cos (3 x)) \cos (3 x^{2}) (6 x)) + \cos (3 x) \ln (10) \frac{3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10)}}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 11.2

Reescribe la expresión.

$\frac{\cos (3 x) \ln (10) (\log (\cos (3 x)) \cos (3 x^{2}) (6 x)) + 3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 12

Simplifica.

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Paso 12.1

Simplifica el numerador.

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Paso 12.1.1

Simplifica cada término.

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Paso 12.1.1.1

Simplifica $6 \ln (10)$ al mover $6$ dentro del algoritmo.

$\frac{\cos (3 x) \ln (10^{6}) \log (\cos (3 x)) \cos (3 x^{2}) x + 3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 12.1.1.2

Eleva $10$ a la potencia de $6$ .

$\frac{\cos (3 x) \ln (1000000) \log (\cos (3 x)) \cos (3 x^{2}) x + 3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 12.1.2

Reordena los factores en $\cos (3 x) \ln (1000000) \log (\cos (3 x)) \cos (3 x^{2}) x + 3 \sin (3 x) \sin (3 x^{2})$ .

$\frac{x \cos (3 x) \ln (1000000) \log (\cos (3 x)) \cos (3 x^{2}) + 3 \sin (3 x) \sin (3 x^{2})}{\cos (3 x) \ln (10) \log^{2} (\cos (3 x))}$

Paso 12.2

Reordena los términos.

$\frac{x \cos (3 x) \cos (3 x^{2}) \ln (1000000) \log (\cos (3 x)) + 3 \sin (3 x) \sin (3 x^{2})}{\log^{2} (\cos (3 x)) \cos (3 x) \ln (10)}$