#### If is a differentiable function in the interval (0, ∞) such that = 1 and    for each , then is equal to : Option 1) Option 2) Option 3) Option 4)

As we learnt in

L - Hospital Rule -

- wherein

Now, let y=f(x)

If

Put, x=1, y=1

Put,

Option 1)

This option is incorrect.

Option 2)

This option is incorrect.

Option 3)

This option is incorrect.

Option 4)

This option is correct.