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Derivative of 1/(chx)^2

Function f() - derivative -N order at the point
v

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from to

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The solution

You have entered [src]
   1    
--------
    2   
cosh (x)
$$\frac{1}{\cosh^{2}{\left(x \right)}}$$
1/(cosh(x)^2)
The graph
The first derivative [src]
   -2*sinh(x)   
----------------
            2   
cosh(x)*cosh (x)
$$- \frac{2 \sinh{\left(x \right)}}{\cosh{\left(x \right)} \cosh^{2}{\left(x \right)}}$$
The second derivative [src]
  /           2   \
  |     3*sinh (x)|
2*|-1 + ----------|
  |          2    |
  \      cosh (x) /
-------------------
          2        
      cosh (x)     
$$\frac{2 \left(\frac{3 \sinh^{2}{\left(x \right)}}{\cosh^{2}{\left(x \right)}} - 1\right)}{\cosh^{2}{\left(x \right)}}$$
The third derivative [src]
  /          2   \        
  |    3*sinh (x)|        
8*|2 - ----------|*sinh(x)
  |         2    |        
  \     cosh (x) /        
--------------------------
             3            
         cosh (x)         
$$\frac{8 \left(- \frac{3 \sinh^{2}{\left(x \right)}}{\cosh^{2}{\left(x \right)}} + 2\right) \sinh{\left(x \right)}}{\cosh^{3}{\left(x \right)}}$$