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1. The sides of a triangle ABC are ...
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1. The sides of a triangle ABC are (x2 + x + 1), (2x + 1) and (x2 - 1). Find the greatest angle of the triangle. 1. AD
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( A=x^{2}-1>0 quad B=x^{2}+x+1>0 quad C=2 x+1>0 )
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