The greatest angle of the triangle whose three sides are x2 + x + 1, 2x + 1 and x2 – 1 is equal to….

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The greatest angle of the triangle whose three sides are x² + x + 1, 2x + 1 and x² – 1 is equal to

Options :-

1. 150^o
2. 90^o
3. 135^o
4. 120^o

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