On the Stability of the Functional Equation
f ( 2 x + y ) + f ( x + y 2 ) = 2 f ( x ) f ( y ) f ( x ) + f ( y ) + 2 f ( x + y ) f ( y - x ) 3 f ( y - x ) - f ( x + y ) f\left( {2x + y} \right) + f\left( {{{x + y} \over 2}} \right) = {{2f\left( x \right)f\left( y \right)} \over {f\left( x \right) + f\left( y \right)}} + {{2f\left( {x + y} \right)f\left( {y - x} \right)} \over {3f\left( {y - x} \right) - f\left( {x + y} \right)}}
04 nov 2020
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