JEE Main · 2024 · 31 Jan 2024 · Shift 1 · Differentiation

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If for all , then is equal to
  1. (A)48
  2. (B)24
  3. (C)42✓ Correct
  4. (D)18

Answer: (C)

Solution



(Expanding along the first column: .)

Differentiating using the product rule for determinants (differentiate one row at a time and sum), then evaluating at :


JEE Main · 2024 · 31 Jan 2024 · Shift 1 · Single correct option

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