Make r the subject

I could only get

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- January 6th 2010, 12:40 PMMukilabSubject of the formula
Make r the subject

I could only get

- January 6th 2010, 12:44 PMe^(i*pi)
- January 6th 2010, 12:50 PMMukilab
- January 6th 2010, 12:51 PMe^(i*pi)
- January 6th 2010, 12:53 PMMukilab