Solución detallada
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No logro encontrar los pasos en la búsqueda de esta derivada.
Perola derivada
Respuesta:
x*cos(7*x)
(-x) *((-7*x*sin(7*x) + cos(7*x))*log(-x) + cos(7*x))
$$\left(- x\right)^{x \cos{\left(7 x \right)}} \left(\left(- 7 x \sin{\left(7 x \right)} + \cos{\left(7 x \right)}\right) \log{\left(- x \right)} + \cos{\left(7 x \right)}\right)$$
x*cos(7*x) / 2 -cos(7*x) + 7*x*sin(7*x) \
(-x) *|(-cos(7*x) + (-cos(7*x) + 7*x*sin(7*x))*log(-x)) - 7*sin(7*x) - ------------------------ - 7*(2*sin(7*x) + 7*x*cos(7*x))*log(-x)|
\ x /
$$\left(- x\right)^{x \cos{\left(7 x \right)}} \left(- 7 \left(7 x \cos{\left(7 x \right)} + 2 \sin{\left(7 x \right)}\right) \log{\left(- x \right)} + \left(\left(7 x \sin{\left(7 x \right)} - \cos{\left(7 x \right)}\right) \log{\left(- x \right)} - \cos{\left(7 x \right)}\right)^{2} - 7 \sin{\left(7 x \right)} - \frac{7 x \sin{\left(7 x \right)} - \cos{\left(7 x \right)}}{x}\right)$$
x*cos(7*x) / 3 -cos(7*x) + 7*x*sin(7*x) 14*(2*sin(7*x) + 7*x*cos(7*x)) / -cos(7*x) + 7*x*sin(7*x) \ \
(-x) *|- (-cos(7*x) + (-cos(7*x) + 7*x*sin(7*x))*log(-x)) - 49*cos(7*x) + ------------------------ - ------------------------------ + 3*(-cos(7*x) + (-cos(7*x) + 7*x*sin(7*x))*log(-x))*|7*sin(7*x) + ------------------------ + 7*(2*sin(7*x) + 7*x*cos(7*x))*log(-x)| + 49*(-3*cos(7*x) + 7*x*sin(7*x))*log(-x)|
| 2 x \ x / |
\ x /
$$\left(- x\right)^{x \cos{\left(7 x \right)}} \left(49 \left(7 x \sin{\left(7 x \right)} - 3 \cos{\left(7 x \right)}\right) \log{\left(- x \right)} - \left(\left(7 x \sin{\left(7 x \right)} - \cos{\left(7 x \right)}\right) \log{\left(- x \right)} - \cos{\left(7 x \right)}\right)^{3} + 3 \left(\left(7 x \sin{\left(7 x \right)} - \cos{\left(7 x \right)}\right) \log{\left(- x \right)} - \cos{\left(7 x \right)}\right) \left(7 \left(7 x \cos{\left(7 x \right)} + 2 \sin{\left(7 x \right)}\right) \log{\left(- x \right)} + 7 \sin{\left(7 x \right)} + \frac{7 x \sin{\left(7 x \right)} - \cos{\left(7 x \right)}}{x}\right) - 49 \cos{\left(7 x \right)} - \frac{14 \left(7 x \cos{\left(7 x \right)} + 2 \sin{\left(7 x \right)}\right)}{x} + \frac{7 x \sin{\left(7 x \right)} - \cos{\left(7 x \right)}}{x^{2}}\right)$$