imo class 12 continuity and differentiability

The derivative of x² eˣ sin x is:

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The derivative of x² eˣ sin x is:

  • A. x eˣ (2 sin x + x sin x + x cos x)
  • B. x eˣ (2 sin x + x sin x − x cos x)
  • C. x eˣ (2 sin x + x sin x + x cos x + cos x)
  • D. eˣ x (sin x + x cos x)

Answer: A) x eˣ (2 sin x + x sin x + x cos x)

Explanation: d/dx [x² eˣ sin x] = 2x eˣ sin x + x² eˣ sin x + x² eˣ cos x = x eˣ (2 sin x + x sin x + x cos x).

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