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0606/11 May/Jun 2026, Question 10: Integrating eˣ, Trig and (ax+b)ⁿ

Cambridge IGCSE Additional Mathematics 0606 · Paper 11 (Non-calculator) · Non-calculator · 8 marks

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The question, in short

Given the second derivative (2x + 10)^(−1/2) − 2x and a stationary point at (3, 64/3), determine the curve's equation y = f(x).

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Solution · 8 marks

  1. 1f′(x) = (2x + 10)^(1/2) − x² + c
  2. 2Stationary at x = 3: √16 − 9 + c = 0, so c = 5
  3. 3f(x) = (1/3)(2x + 10)^(3/2) − x³/3 + 5x + d
  4. 4At (3, 64/3): (1/3)(64) − 9 + 15 + d = 64/3
  5. 5d = −6
  6. 6y = (1/3)(2x + 10)^(3/2) − x³/3 + 5x − 6

Answery = (1/3)(2x + 10)^(3/2) − x³/3 + 5x − 6

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