JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Differentiation

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If ,

Then:
  1. (A)
  2. (B)✓ Correct
  3. (C)
  4. (D)

Answer: (B)

Solution

At the relation gives , so or . Differentiating, , which at (where ) forces for either root. Differentiating again, ; at this gives , and at it gives , so . In both cases .

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Single correct option

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