Monday, October 3, 2016

calculation puzzle - I want an exact value of Pi


Use 1, 2, 2, 2 (Each number used exactly once) to form π.

I want an exact value of π, not any approximation.


Available operators:



+ - * / ( ) ^ !
You can use any one of them for any times.



Hint:



Think about a special feature of the "!".






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