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Thursday, 05 March 2026
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If y = x sin x, Find \(\frac{d^2 y}{d^2 x}\)

If y = x sin x, Find \(\frac{d^2 y}{d^2 x}\)
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A 2 cosx - x sinx
  • B Sinx + x cosx
  • C Sinx - x cosx
  • D X sinx - 2 cosx
Correct Answer: Option A
Explanation:
\(y = x \sin x\)
\(\frac{\mathrm d y}{\mathrm d x} = x \cos x + \sin x\)
\(\frac{\mathrm d^{2} y}{\mathrm d x^{2}} = x (- \sin x) + \cos x + \cos x\)
= \(2 \cos x - x \sin x\)

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