Cálculo Exemplos

$\frac{8 x}{\sin (x) + \cos (x)}$

Etapa 1

Como $8$ é constante em relação a $x$ , a derivada de $\frac{8 x}{\sin (x) + \cos (x)}$ em relação a $x$ é $8 \frac{d}{d x} [\frac{x}{\sin (x) + \cos (x)}]$ .

$8 \frac{d}{d x} [\frac{x}{\sin (x) + \cos (x)}]$

Etapa 2

Diferencie usando a regra do quociente, que determina que $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ é $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ , em que $f (x) = x$ e $g (x) = \sin (x) + \cos (x)$ .

$8 \frac{(\sin (x) + \cos (x)) \frac{d}{d x} [x] - x \frac{d}{d x} [\sin (x) + \cos (x)]}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 3

Diferencie.

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Etapa 3.1

Diferencie usando a regra da multiplicação de potências, que determina que $\frac{d}{d x} [x^{n}]$ é $n x^{n - 1}$ , em que $n = 1$ .

$8 \frac{(\sin (x) + \cos (x)) \cdot 1 - x \frac{d}{d x} [\sin (x) + \cos (x)]}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 3.2

Multiplique $\sin (x) + \cos (x)$ por $1$ .

$8 \frac{\sin (x) + \cos (x) - x \frac{d}{d x} [\sin (x) + \cos (x)]}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 3.3

De acordo com a regra da soma, a derivada de $\sin (x) + \cos (x)$ com relação a $x$ é $\frac{d}{d x} [\sin (x)] + \frac{d}{d x} [\cos (x)]$ .

$8 \frac{\sin (x) + \cos (x) - x (\frac{d}{d x} [\sin (x)] + \frac{d}{d x} [\cos (x)])}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 4

A derivada de $\sin (x)$ em relação a $x$ é $\cos (x)$ .

$8 \frac{\sin (x) + \cos (x) - x (\cos (x) + \frac{d}{d x} [\cos (x)])}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 5

A derivada de $\cos (x)$ em relação a $x$ é $- \sin (x)$ .

$8 \frac{\sin (x) + \cos (x) - x (\cos (x) - \sin (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 6

Combine $8$ e $\frac{\sin (x) + \cos (x) - x (\cos (x) - \sin (x))}{{(\sin (x) + \cos (x))}^{2}}$ .

$\frac{8 (\sin (x) + \cos (x) - x (\cos (x) - \sin (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7

Simplifique.

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Etapa 7.1

Aplique a propriedade distributiva.

$\frac{8 (\sin (x) + \cos (x) - x \cos (x) - x (- \sin (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.2

Aplique a propriedade distributiva.

$\frac{8 \sin (x) + 8 \cos (x) + 8 (- x \cos (x)) + 8 (- x (- \sin (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.3

Simplifique cada termo.

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Etapa 7.3.1

Multiplique $- 1$ por $8$ .

$\frac{8 \sin (x) + 8 \cos (x) - 8 (x \cos (x)) + 8 (- x (- \sin (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.3.2

Multiplique $- x (- \sin (x))$ .

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Etapa 7.3.2.1

Multiplique $- 1$ por $- 1$ .

$\frac{8 \sin (x) + 8 \cos (x) - 8 x \cos (x) + 8 (1 x \sin (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.3.2.2

Multiplique $x$ por $1$ .

$\frac{8 \sin (x) + 8 \cos (x) - 8 x \cos (x) + 8 (x \sin (x))}{{(\sin (x) + \cos (x))}^{2}}$

$\frac{8 \sin (x) + 8 \cos (x) - 8 x \cos (x) + 8 x \sin (x)}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.4

Reordene os termos.

$\frac{- 8 x \cos (x) + 8 x \sin (x) + 8 \sin (x) + 8 \cos (x)}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5

Fatore $8$ de $- 8 x \cos (x) + 8 x \sin (x) + 8 \sin (x) + 8 \cos (x)$ .

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Etapa 7.5.1

Fatore $8$ de $- 8 x \cos (x)$ .

$\frac{8 (- x \cos (x)) + 8 x \sin (x) + 8 \sin (x) + 8 \cos (x)}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5.2

Fatore $8$ de $8 x \sin (x)$ .

$\frac{8 (- x \cos (x)) + 8 (x \sin (x)) + 8 \sin (x) + 8 \cos (x)}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5.3

Fatore $8$ de $8 \sin (x)$ .

$\frac{8 (- x \cos (x)) + 8 (x \sin (x)) + 8 (\sin (x)) + 8 \cos (x)}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5.4

Fatore $8$ de $8 \cos (x)$ .

$\frac{8 (- x \cos (x)) + 8 (x \sin (x)) + 8 (\sin (x)) + 8 (\cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5.5

Fatore $8$ de $8 (- x \cos (x)) + 8 (x \sin (x))$ .

$\frac{8 (- x \cos (x) + x \sin (x)) + 8 (\sin (x)) + 8 (\cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5.6

Fatore $8$ de $8 (- x \cos (x) + x \sin (x)) + 8 (\sin (x))$ .

$\frac{8 (- x \cos (x) + x \sin (x) + \sin (x)) + 8 (\cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.5.7

Fatore $8$ de $8 (- x \cos (x) + x \sin (x) + \sin (x)) + 8 (\cos (x))$ .

$\frac{8 (- x \cos (x) + x \sin (x) + \sin (x) + \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.6

Fatore $- 1$ de $- x \cos (x)$ .

$\frac{8 (- (x \cos (x)) + x \sin (x) + \sin (x) + \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.7

Fatore $- 1$ de $x \sin (x)$ .

$\frac{8 (- (x \cos (x)) - (- x \sin (x)) + \sin (x) + \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.8

Fatore $- 1$ de $- (x \cos (x)) - (- x \sin (x))$ .

$\frac{8 (- (x \cos (x) - x \sin (x)) + \sin (x) + \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.9

Fatore $- 1$ de $\sin (x)$ .

$\frac{8 (- (x \cos (x) - x \sin (x)) - 1 (- \sin (x)) + \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.10

Fatore $- 1$ de $- (x \cos (x) - x \sin (x)) - 1 (- \sin (x))$ .

$\frac{8 (- (x \cos (x) - x \sin (x) - \sin (x)) + \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.11

Fatore $- 1$ de $\cos (x)$ .

$\frac{8 (- (x \cos (x) - x \sin (x) - \sin (x)) - 1 (- \cos (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.12

Fatore $- 1$ de $- (x \cos (x) - x \sin (x) - \sin (x)) - 1 (- \cos (x))$ .

$\frac{8 (- (x \cos (x) - x \sin (x) - \sin (x) - \cos (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.13

Reescreva $- (x \cos (x) - x \sin (x) - \sin (x) - \cos (x))$ como $- 1 (x \cos (x) - x \sin (x) - \sin (x) - \cos (x))$ .

$\frac{8 (- 1 (x \cos (x) - x \sin (x) - \sin (x) - \cos (x)))}{{(\sin (x) + \cos (x))}^{2}}$

Etapa 7.14

Mova o número negativo para a frente da fração.

$- \frac{8 (x \cos (x) - x \sin (x) - \sin (x) - \cos (x))}{{(\sin (x) + \cos (x))}^{2}}$