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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

माना \(f : R \rightarrow R , f ( x )= x ^3+ x -5\) से परिभापित है यदि \(g ( x )\) का फलन इस प्रकार परिभापित है कि \(f ( g ( x ))= x , \forall x \in R\) तो \(g ^{\prime}\) \((63)\) बराबर है

  1. A 0.02
  2. B 0.061
  3. C 0.88
  4. D 1.86
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Answer & Solution

Correct Answer

(A) 0.02

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Detailed explanation

\(f(x)=x^{3}+x-5\) \(\Rightarrow \quad f^{\prime}(x)=3 x^{2}+1 \Rightarrow\) increasing function \(\Rightarrow \quad\) invertible \(\Rightarrow \quad g(x)\) is inverse of \(f(x)\) \(\Rightarrow \quad g(f(x))=x\) \(\Rightarrow \quad g^{\prime}(f(x)) f^{\prime}(x)=1\)…
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