Докажите, что следующие неравенства верные:
а) [tex](x+2)^{2} \ \textgreater \ x (x + 4)
[/tex]
b) [tex] a^{2} + 1 \geq 2 (3a - 4)[/tex]
c) [tex]4a + \frac{1}{a} \geq 4[/tex] при а>0
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