User Portlet
| Discussions |
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| I still don't see what is incorrect. In[1]:= D[Cos[x - c t], t] Out[1]= -c Sin[c t - x] |
User Portlet | Discussions |
|---|
| I still don't see what is incorrect. In[1]:= D[Cos[x - c t], t] Out[1]= -c Sin[c t - x] |