The sides of a traingle are \( x^{2}+x+1,2 x+1 \), and \( x^{2}-1 \); prove that the greatest an...
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0The sides of a traingle are \( x^{2}+x+1,2 x+1 \), and \( x^{2}-1 \); prove that the greatest angle is \( 120^{\circ} \).
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