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

ધારો કે \(f : R \rightarrow R\) એ \(f ( x )= x ^{3}+ x -5\) પ્રમાણે વ્યાખ્યાયિત છે. જો વિધેય \(g ( x )\) માટે  \(f ( g ( x ))= x\), \(\forall x \in R\) થાય ,તો \(g ^{\prime}(63)\) ની કિમત ......... છે. 

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

(A) 0.02

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\(f(x)=x^{3}+x-5\) \(\Rightarrow \quad f^{\prime}(x)=3 x^{2}+1 \Rightarrow\) 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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