bất đẳng thức

E

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BĐT \Leftrightarrow $2a^4+2+b^4+2b^2+1 \ge 2a^2b^2+4ab+2$

\Leftrightarrow $a^4-2a^2b^2+b^4+a^4-2a^2+1+2(a^2+b^2)-4ab \ge 0$

\Leftrightarrow $(a^2-b^2)^2+(a^2-1)^2+2(a-b)^2 \ge 0$ (ldung)

\Rightarrow đpcm
 
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