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Compute arctan(1) + arctan(2) + arctan(3).

 Dec 25, 2019
 #1
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It 's PI!! 

3.14........

 Dec 25, 2019
 #2
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arctan(1) + arctan(2) + arctan(3) = 3.141592653589      from the Web2.0 calculator ...as guest found.

 Dec 25, 2019

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