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  • Please help! Which of these is an identity function in x ?

Which of these is an identity function in x ? 

  • Option 1)

    f|(x)=\sin \sin x^{-1}

     

     

     

  • Option 2)

    g(x)=ln\: e^{x}

  • Option 3)

    f(x)=e^{ln\: x}

  • Option 4)

    f(x)=x

 

Answers (1)

best_answer

As we learned 

 

Identity function -

f(x)=x,\forall x\in\rightarrow \left ( f \right )

It is denoted by I_{A}

if f:A\rightarrow B

- wherein

 

 

f(x)=x is the identity function. 

 


Option 1)

f|(x)=\sin \sin x^{-1}

 

 

 

Option 2)

g(x)=ln\: e^{x}

Option 3)

f(x)=e^{ln\: x}

Option 4)

f(x)=x

Posted by

Himanshu

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