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JEE Mains · Maths · STD 12 - 7.2 definite integral

यदि \(I=\int \limits_{1}^{2} \frac{d x}{\sqrt{2 x^{3}-9 x^{2}+12 x+4}}\), है, तो 

  1. A \(\frac{1}{9}< I ^{2}<\frac{1}{8}\)
  2. B \(\frac{1}{16}< I ^{2}<\frac{1}{9}\)
  3. C \(\frac{1}{6}< I ^{2}<\frac{1}{2}\)
  4. D \(\frac{1}{8}< I ^{2}<\frac{1}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{1}{9}< I ^{2}<\frac{1}{8}\)

Step-by-step Solution

Detailed explanation

\(f(x)=\frac{1}{\sqrt{2 x^{3}-9 x^{2}+12 x+4}}\) \(f^{\prime}(x)=\frac{-6(x-1)(x-2)}{2\left(2 x^{3}-9 x^{2}+12 x+4\right)^{3 / 2}}\) \(\therefore f(\mathrm{x})\) is decreasing in \((1,2)\) \(f(1)=\frac{1}{3} ; f(2)=\frac{1}{\sqrt{8}}\)…
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