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)
$$\frac{8 \left(- \frac{3 \sinh^{2}{\left(x \right)}}{\cosh^{2}{\left(x \right)}} + 2\right) \sinh{\left(x \right)}}{\cosh^{3}{\left(x \right)}}$$