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**A**, can be expressed in sigma notation as

[tex]\sum[/tex]

**A**where i runs from 1 to 3, i.e.

_{i}**A**for x coordinate,

_{1}**A**for y coordinate and

_{2}**A**for z coordinate.

_{3}I wonder how to express vector

**A**in polar form using sigma notation. Could anyone share their knowledge to me?