B
badboy_love_kutegirl


Cho [TEX]a,b,c,d>0,a+b+c+d=4[/TEX]
C/M [TEX]\frac{a}{1+b^2c}+\frac{b}{1+c^2d}+\frac{c}{1+d^2a}+\frac{d}{1+a^2b}\geq2[/TEX]
C/M [TEX]\frac{a}{1+b^2c}+\frac{b}{1+c^2d}+\frac{c}{1+d^2a}+\frac{d}{1+a^2b}\geq2[/TEX]
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