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Validity Vindication (Posted on 2014-06-18) Difficulty: 2 of 5
Given a square piece of paper, prove using paper folding alone this trigonometric identity:

arctan(1/3) + arctan(1) = arctan(2)

*** No geometry instrument aids like straightedge, compass etc are allowed.

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
Solutionsolution in three and a half folds.Jer2014-06-18 15:02:57
a rough methodbroll2014-06-18 11:53:25
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