The number is $\"\"$ .

Consider the function as $\"\"$ and $\"\"$ .

Use linear approximation at $\"\"$ to find out the value of the number $\"\"$ .

Linear approximation of the function is $\"\"$ .

Consider $\"\"$ .

Differentiate on each side with respect to $\"\"$ .

$\"\"$

$\"\"$ .

Substitute $\"\"$ in above function.

$\"\"$

$\"\"$ .

Linear approximation at $\"\"$ is $\"\"$ .

Substitute corresponding values in linear approximation equation.

$\"\"$

The corresponding linear approximation is

$\"\"$ .

Approximate value for $\"\"$ .

$\"\"$

Here, $\"\"$ .

$\"\"$

$\"\"$ .

Approximate value for $\"\"$ .