Answer

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**Hint:**In this problem we need to calculate the derivative of the given function. We can observe that the given function has absolute function. So, we will consider the given function as $\sqrt{{{\left( x-2 \right)}^{2}}}$. Now we will use the substitution method and substitute the value $u=x-2$. Now we will differentiate the $u$ with respect to $x$ as well as we will differentiate the given equation with respect to $x$. Now we will simplify the obtained equation by using the differentiation value of $u$. After substituting this value and simplifying the obtained equation, we will get the required result.

**Complete step by step solution:**

Given that, $\left| x-2 \right|$.

Here in the above equation, we can observe the absolute function, so we can write the above equation as

$\Rightarrow f\left( x \right)=\sqrt{{{\left( x-2 \right)}^{2}}}$

Let us substitute $u=x-2$ in the above equation, then we will get

$\Rightarrow f\left( x \right)=\sqrt{{{u}^{2}}}$

Differentiating the above equation with respect to $x$, then we will get

$\Rightarrow {{f}^{'}}\left( x \right)=\dfrac{d}{dx}\left( \sqrt{{{u}^{2}}} \right)$

We have the differentiation formula $\dfrac{d}{dx}\left( \sqrt{x} \right)=\dfrac{1}{2\sqrt{x}}$. Applying this formula in the above equation, then we will get

$\Rightarrow {{f}^{'}}\left( x \right)=\dfrac{1}{2\sqrt{{{u}^{2}}}}\dfrac{d}{dx}\left( {{u}^{2}} \right)$

Again, we have the differentiation formula $\dfrac{d}{dx}\left( {{x}^{n}} \right)=n{{x}^{n-1}}$. Applying this formula in the above equation, then we will have

$\Rightarrow {{f}^{'}}\left( x \right)=\dfrac{1}{2\sqrt{{{u}^{2}}}}\left( 2u \right)\dfrac{du}{dx}...\left( \text{i} \right)$

To find the derivative of the given equation, we need to have the value of $\dfrac{du}{dx}$. We have $u=x-2$, so the value of $\dfrac{du}{dx}$ will be

$\begin{align}

& \dfrac{du}{dx}=\dfrac{d}{dx}\left( x-2 \right) \\

& \Rightarrow \dfrac{du}{dx}=1-0 \\

& \Rightarrow \dfrac{du}{dx}=1 \\

\end{align}$

Substituting this value in the equation $\left( \text{i} \right)$ and simplifying, then we will get

$\Rightarrow {{f}^{'}}\left( x \right)=\dfrac{u}{\sqrt{{{u}^{2}}}}\left( 1 \right)$

Substituting the all the values we have, then we will get the derivative of the given equation as

$\therefore {{f}^{'}}\left( x \right)=\dfrac{x-2}{\left| x-2 \right|}$

**Note:**We can directly find the derivative of the given equation by using the differentiation formula $\dfrac{d}{dx}\left( \left| f\left( x \right) \right| \right)=\dfrac{f\left( x \right)}{\left| f\left( x \right) \right|}$. From this formula we can have the derivative of the given function as

$\Rightarrow \dfrac{d}{dx}\left( \left| x-2 \right| \right)=\dfrac{x-2}{\left| x-2 \right|}$

From both the methods we got the same result.

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