Partial equation problem

1. Aug 21, 2010

Petar Mali

Can you give me idea how to solve equation?

$$\Delta f=cos(\vec{k}\cdot\vec{r})$$

where $$\Delta$$ is Laplacian and $$\vec{k}=\vec{const}$$

2. Aug 22, 2010

JJacquelin

What is r ?

3. Aug 22, 2010

Petar Mali

$$\vec{r}=x\vec{e}_x+y\vec{e}_y+z\vec{e}_z$$

4. Aug 22, 2010

JJacquelin

An obvious particular solution allows to express the general solution (attachment)

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