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JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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If the sides of a triangle are x2+x+1,  x2−1,  2x+1{x^2} + x + 1,\,\,{x^2} - 1,\,\,2x + 1, where x>1x > 1, then the largest angle is
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Correct option: D
30∘\mathrm{30^\circ }
Option A (120°) is correct because by using the cosine rule, the largest angle opposite the largest side is found to be 120 degrees.

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