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The derivative of the function/ x/sqrt(x^2-1)

Derivative of x/sqrt(x^2-1)

The solution

You have entered [src]

     x     
-----------
   ________
  /  2     
\/  x  - 1

$$\frac{x}{\sqrt{x^{2} - 1}}$$

d /     x     \
--|-----------|
dx|   ________|
  |  /  2     |
  \\/  x  - 1 /

$$\frac{d}{d x} \frac{x}{\sqrt{x^{2} - 1}}$$

Transform

Detail solution

Apply the quotient rule, which is:

$\frac{d}{d x} \frac{f{\left(x \right)}}{g{\left(x \right)}} = \frac{- f{\left(x \right)} \frac{d}{d x} g{\left(x \right)} + g{\left(x \right)} \frac{d}{d x} f{\left(x \right)}}{g^{2}{\left(x \right)}}$

$f{\left(x \right)} = x$ and $g{\left(x \right)} = \sqrt{x^{2} - 1}$ .

To find $\frac{d}{d x} f{\left(x \right)}$ :
1. Apply the power rule: $x$ goes to $1$
To find $\frac{d}{d x} g{\left(x \right)}$ :
1. Let $u = x^{2} - 1$ .
2. Apply the power rule: $\sqrt{u}$ goes to $\frac{1}{2 \sqrt{u}}$
3. Then, apply the chain rule. Multiply by $\frac{d}{d x} \left(x^{2} - 1\right)$ :
  1. Differentiate $x^{2} - 1$ term by term:
    1. The derivative of the constant $-1$ is zero.
    2. Apply the power rule: $x^{2}$ goes to $2 x$
    The result is: $2 x$
  The result of the chain rule is:
  
  $\frac{x}{\sqrt{x^{2} - 1}}$
Now plug in to the quotient rule:

$\frac{- \frac{x^{2}}{\sqrt{x^{2} - 1}} + \sqrt{x^{2} - 1}}{x^{2} - 1}$
Now simplify:

$- \frac{1}{\left(x^{2} - 1\right)^{\frac{3}{2}}}$

The answer is:

$- \frac{1}{\left(x^{2} - 1\right)^{\frac{3}{2}}}$

The graph

Plot the graph f(x)

Plot the graph f'(x)

The first derivative [src]

                    2    
     1             x     
----------- - -----------
   ________           3/2
  /  2        / 2    \   
\/  x  - 1    \x  - 1/

$$- \frac{x^{2}}{\left(x^{2} - 1\right)^{\frac{3}{2}}} + \frac{1}{\sqrt{x^{2} - 1}}$$

Simplify

The second derivative [src]

  /          2 \
  |       3*x  |
x*|-3 + -------|
  |           2|
  \     -1 + x /
----------------
           3/2  
  /      2\     
  \-1 + x /

$$\frac{x \left(\frac{3 x^{2}}{x^{2} - 1} - 3\right)}{\left(x^{2} - 1\right)^{\frac{3}{2}}}$$

Simplify

The third derivative [src]

  /                  /          2 \\
  |                2 |       5*x  ||
  |               x *|-3 + -------||
  |          2       |           2||
  |       3*x        \     -1 + x /|
3*|-1 + ------- - -----------------|
  |           2              2     |
  \     -1 + x         -1 + x      /
------------------------------------
                     3/2            
            /      2\               
            \-1 + x /

$$\frac{3 \left(- \frac{x^{2} \cdot \left(\frac{5 x^{2}}{x^{2} - 1} - 3\right)}{x^{2} - 1} + \frac{3 x^{2}}{x^{2} - 1} - 1\right)}{\left(x^{2} - 1\right)^{\frac{3}{2}}}$$

Simplify

The graph

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Derivative of x/sqrt(x^2-1)

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Piecewise:

The solution