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Ecuación diferencial y'''-y'+y=2*sin(3x)

El profesor se sorprenderá mucho al ver tu solución correcta😉

v

Para el problema de Cauchy:

y() =
y'() =
y''() =
y'''() =
y''''() =

Gráfico:

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Solución

Ha introducido [src]
               3                          
  d           d                           
- --(y(x)) + ---(y(x)) + y(x) = 2*sin(3*x)
  dx           3                          
             dx                           
$$y{\left(x \right)} - \frac{d}{d x} y{\left(x \right)} + \frac{d^{3}}{d x^{3}} y{\left(x \right)} = 2 \sin{\left(3 x \right)}$$
y - y' + y''' = 2*sin(3*x)
Respuesta [src]
                                        /            ____________         3 ____   \         /          ____________         3 ____   \                                                                                                                                             /          ____________         3 ____   \
                                        |  3 ____ 3 /       ____        2*\/ 18    |         |3 ____ 3 /       ____        2*\/ 18    |                                                                                                                                             |3 ____ 3 /       ____        2*\/ 18    |
                                      x*|- \/ 12 *\/  9 + \/ 69   - ---------------|       x*|\/ 12 *\/  9 + \/ 69   + ---------------|    /              /                                ____________\\         /              /                                ____________\\  x*|\/ 12 *\/  9 + \/ 69   + ---------------|
                                        |                              ____________|         |                            ____________|    |  3 ___ 6 ___ |       6          3 ___  2/3 3 /       ____ ||         |  3 ___ 6 ___ |       6          3 ___  2/3 3 /       ____ ||    |                            ____________|
                                        |                           3 /       ____ |         |                         3 /       ____ |    |x*\/ 2 *\/ 3 *|--------------- - \/ 2 *3   *\/  9 + \/ 69  ||         |x*\/ 2 *\/ 3 *|--------------- - \/ 2 *3   *\/  9 + \/ 69  ||    |                         3 /       ____ |
                                        \                           \/  9 + \/ 69  /         \                         \/  9 + \/ 69  /    |              |   ____________                             ||         |              |   ____________                             ||    \                         \/  9 + \/ 69  /
                                      ----------------------------------------------       --------------------------------------------    |              |3 /       ____                              ||         |              |3 /       ____                              ||  --------------------------------------------
       2*sin(3*x)   60*cos(3*x)                             6                                                   12                         |              \\/  9 + \/ 69                               /|         |              \\/  9 + \/ 69                               /|                       12                     
y(x) = ---------- + ----------- + C3*e                                               + C1*e                                            *sin|------------------------------------------------------------| + C2*cos|------------------------------------------------------------|*e                                            
          901           901                                                                                                                \                             12                             /         \                             12                             /                                              
$$y{\left(x \right)} = C_{1} e^{\frac{x \left(\frac{2 \sqrt[3]{18}}{\sqrt[3]{\sqrt{69} + 9}} + \sqrt[3]{12} \sqrt[3]{\sqrt{69} + 9}\right)}{12}} \sin{\left(\frac{\sqrt[3]{2} \sqrt[6]{3} x \left(- \sqrt[3]{2} \cdot 3^{\frac{2}{3}} \sqrt[3]{\sqrt{69} + 9} + \frac{6}{\sqrt[3]{\sqrt{69} + 9}}\right)}{12} \right)} + C_{2} e^{\frac{x \left(\frac{2 \sqrt[3]{18}}{\sqrt[3]{\sqrt{69} + 9}} + \sqrt[3]{12} \sqrt[3]{\sqrt{69} + 9}\right)}{12}} \cos{\left(\frac{\sqrt[3]{2} \sqrt[6]{3} x \left(- \sqrt[3]{2} \cdot 3^{\frac{2}{3}} \sqrt[3]{\sqrt{69} + 9} + \frac{6}{\sqrt[3]{\sqrt{69} + 9}}\right)}{12} \right)} + C_{3} e^{\frac{x \left(- \sqrt[3]{12} \sqrt[3]{\sqrt{69} + 9} - \frac{2 \sqrt[3]{18}}{\sqrt[3]{\sqrt{69} + 9}}\right)}{6}} + \frac{2 \sin{\left(3 x \right)}}{901} + \frac{60 \cos{\left(3 x \right)}}{901}$$
Clasificación
nth linear constant coeff undetermined coefficients
nth linear constant coeff variation of parameters
nth linear constant coeff variation of parameters Integral