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JEE Mains · Maths · STD 12 - 7.2 definite integral

Let \(f\) be a differentiable function satisfying \(f ( x )=\frac{2}{\sqrt{3}} \int_{0}^{\sqrt{3}} f \left(\frac{\lambda^{2} x }{3}\right) d \lambda, x >0\) and \(f (1)=\sqrt{3}\). If \(y=f(x)\) passes through the point \((\alpha, 6)\), then \(\alpha\) is equal to \(.........\)

  1. A \(6\)
  2. B \(12\)
  3. C \(4\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(12\)

Step-by-step Solution

Detailed explanation

Let, \(\frac{\lambda^{2} x }{3}= t\) \(\frac{2 \lambda x }{3} d \lambda= dt\) \(d \lambda=\frac{3}{2} \cdot \frac{1 \sqrt{ x }}{ x \cdot \sqrt{3} \sqrt{ t }} dt\) \(d \lambda=\frac{\sqrt{3}}{2} \cdot \frac{1}{\sqrt{ x }} \cdot \frac{ dt }{\sqrt{ t }}\) So,…
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