ex5_7.dir

来自「Programs for the book Advanced Engineeri」· DIR 代码 · 共 29 行

ex5_7

yeq =

D2y+3*Dy+2*y=f(t)

 
  /   /                    /
  |  |                    |
- |- |  f(t) exp(t) dt +  |  f(t) exp(2 t) dt exp(-2 t) exp(t) - C1
  |  |                    |
  \ /                    /

                          \
                          |
     - C2 exp(-2 t) exp(t)|/exp(t)
                          |
                          /

yeq =

D2y+3*Dy+2*y=exp(-.5*t)

 
               4 exp(- 1/2 t) exp(t) + 3 C1 + 3 C2 exp(-2 t) exp(t)
           1/3 ----------------------------------------------------
                                      exp(t)
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