[" For any vector "vec r" ,the value of ...

[" For any vector "vec r" ,the value of "],[qquad hat i times(vec r timeshat imath)+hat j times(vec r timeshat jmath)+hat k times(vec r timeshat k)," is "]

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Writhe the value of ( vec adot hat i) hat i+( vec adot hat j) hat j+( vec adot hat k) hat k\ w h e r e\ vec a is any vector.