If `(log)_e4=1. 3868` , then `(log)_e 4.01=` (a) 1.3968 (b) 1.3898 (c) 1.3893 (d) none of these

Explanation

let `y=f(x)=log x`

Let `x=4`,

`x+Delta x=4.01`

`Delta {x}=0.01`,

For `x=4`,

`Y=log 4=1.3868`

`y=log x`

`frac{d y}{d x}=frac{1}{x}=frac{1}{4}`

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