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x-y-z-gt-0-xy-yz-zx-2xyz-1-prove-that-1-x-2-1-y-2-1-z-2-3-3-2-




Question Number 224017 by hardmath last updated on 14/Aug/25
x,y,z>0  xy+yz+zx+2xyz=1  prove that:  (√(1−x^2 )) + (√(1−y^2 )) + (√(1−z^2 )) ≤ ((3 (√3))/2)
$$\mathrm{x},\mathrm{y},\mathrm{z}>\mathrm{0} \\ $$$$\mathrm{xy}+\mathrm{yz}+\mathrm{zx}+\mathrm{2xyz}=\mathrm{1} \\ $$$$\mathrm{prove}\:\mathrm{that}: \\ $$$$\sqrt{\mathrm{1}−\mathrm{x}^{\mathrm{2}} }\:+\:\sqrt{\mathrm{1}−\mathrm{y}^{\mathrm{2}} }\:+\:\sqrt{\mathrm{1}−\mathrm{z}^{\mathrm{2}} }\:\leqslant\:\frac{\mathrm{3}\:\sqrt{\mathrm{3}}}{\mathrm{2}} \\ $$

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