The sides of a triangle ABC are (x^(2) +...

The sides of a triangle ABC are `(x^(2) + x +1),(2x+1)` and `(x^(2)-1)`. Find the greatest angle of the triangle.

A

`pi//3`

B

`pi//4`

C

`pi//6`

D

`2pi//3`

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The correct Answer is:

D

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