$$\sqrt{x-x^3}+\sqrt{x+x^3}$$
Edited by nguyenta98ka, 24-04-2012 - 10:42.
Edited by nguyenta98ka, 24-04-2012 - 10:42.
Sai rùi$BT^2\leq (1+1)(x-x^3+x+x^3)\leq2.2=4$
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