Докажите неравенство: (y-1)(y+1)>y^2-2 подробно
(y-1)(y+1) = y^2-1y^2-1>y^2-2
(y-1)(y+1)>y²-2
y²-1>y²-2
-1>-2
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(y-1)(y+1) = y^2-1
y^2-1>y^2-2
(y-1)(y+1)>y²-2
y²-1>y²-2
-1>-2