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====== Deriving the "Master Formula" ======

===== The Prompt =====

**"Write down what it is we want to write to complete the expression below"**

$$ df = (......) \cdot (dr\hat{r}+rd\phi\hat{\phi} )$$ 

===== Context =====

This [[strategy:smallwhiteboard:|SWBQ]]

===== Wrap Up =====

{{swbq:vfsw:vfswmaster.ppt|Powerpoint slide}}
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{{swbq:vfsw:vfswmaster.pdf|PDF slide}}


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