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CUET · MATHS · PYQ PAPER 2025

If \(y=\sqrt{a x+b}\), then \(y \frac{d^2 y}{d x^2}+\left(\frac{d y}{d x}\right)^2=\)

  1. A 0
  2. B 1
  3. C 2
  4. D 4
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(A) 0

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\( \frac{dy}{dx} = \frac{a}{2\sqrt{ax+b}} \) \( \frac{d^2y}{dx^2} = -\frac{a^2}{4(ax+b)^{3/2}} \) \( y \frac{d^2 y}{d x^2}+\left(\frac{d y}{d x}\right)^2 = \sqrt{ax+b} \left(-\frac{a^2}{4(ax+b)^{3/2}}\right) + \left(\frac{a}{2\sqrt{ax+b}}\right)^2 \)…
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