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CUET · MATHS · PYQ PAPER 2025

The value of the integral \(I=\int_0^1 \frac{1}{\sqrt{1+3 \sqrt{x}}} d x\) is:

  1. A 16/27
  2. B 8/3
  3. C 2/9
  4. D 8/9
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Answer & Solution

Correct Answer

(A) 16/27

Step-by-step Solution

Detailed explanation

Let \(u=1+3\sqrt{x}\). Then \(du = \frac{3}{2\sqrt{x}} dx = \frac{3}{2(u-1)/3} dx = \frac{9}{2(u-1)} dx \implies dx = \frac{2(u-1)}{9} du\). Limits: \(x=0 \implies u=1\), \(x=1 \implies u=4\).…
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