Докажите неравенство с помощью неравенства Коши-Буняковского
[tex]a^{2} +b^{2} +c^{2} +3\geq 2(a+b+c)\\\\(\sqrt{x} +1)(\sqrt{y} +1)(\sqrt{x} +\sqrt{y} )\geq 8\sqrt{xy}[/tex]
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