If the sides of a triangle are x^2+x+1, x^2-1 and 2x+1, where x>1, then the largest angle is

JEE Main Mathematics question

Not in JEE syllabus

If the sides of a triangle are , and , where , then the largest angle is

Answer: (A)

For the largest side is (it exceeds both and ). Apply the cosine rule to the angle opposite it:

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Question ID VK-008466