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OpenStudy (mathmagician):
Prove:sqrt((0.2x+0.4y-0.2z-0.4t)^2+(-0.3x-0.6y+ +0.3z+0.6t)^2) < c*sqrt((x-t)^2+(x-z)^2) Where c is from interval (0;1]
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OpenStudy (mathmagician):
Sorry, there should be (y-t)^2, not x-t
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