Solutions of equation - I.S.I. 2018 Problem 1

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Find all pairs ( (x,y) ) with (x,y) real, satisfying the equations $$\sin\bigg(\frac{x+y}{2}\bigg)=0~,~\vert x\vert+\vert y\vert=1$$

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8 comments on “Solutions of equation - I.S.I. 2018 Problem 1”

    1. I think the name of the book is Challenging Mathematical Problems with elementary solutions. There are about 300 problems in the book and somewhere at the end of it, this problem is given

      1. Sorry again for bothering you but i culdn’t find the problem in yaglom.can u please help with page no.!

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