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How build a ?TestFuntion that applied to a list gives only the elements that are function of x


How build a ?TestFuntion that applied to a list give only the elements 
that are function of x

Example:

In[]:= {Sin[a x], b x, t, c r}/.?TestFuntion

gives

Out[] = {Sin[a x], b x}

Thanks

Guillermo Sanchez


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