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miercuri, 12 ianuarie 2022

Nelson Tunala, Geometria y Trigonometria Magistral, https://www.facebook.com/photo/?fbid=4676493092419131&set=gm.3275111282718308


 

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Nice problem, lost source, again

 Today I saw an old problem on fb geometry sites, with a very nice solution bearing the inconfoundable signature of Master Hasan Ata; attach...