#### THE THREE COSINES IDENTITY

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#### A SIMPLE PROOF FOR SANDOR’S INEQUALITY

Article by Daniel Sitaru-Romania, Hikmat Mammadov-Azerbaijan A SIMPLE PROOF FOR SANDOR’S INEQUALITY

Article by Daniel Sitaru, Claudia Nănuți A NEW PROOF FOR IONESCU-WEITZENBOCK’S INEQUALITY USING THE TORICELLI’S POINT

#### A SIMPLE PROOF FOR DURELL’S INEQUALITY

Article by Daniel Sitaru-Romania A SIMPLE PROOF FOR DURELL’S INEQUALITY

#### A NEW MEHMET ȘAHIN’S CONFIGURATION

Article by Daniel Sitaru, Claudia Nănuți-Romania A NEW MEHMET ȘAHIN’S CONFIGURATION

Article by D.M.Bătinețu-Giurgiu,Mihaly Bencze,Daniel Sitaru,Neculai Stanciu-Romania CERTAIN LIMITS OF FIBONACCI AND LUCAS SEQUENCES AND FUNCTIONS