-k
--------------
___________
/ 2 2
\/ 1 - k *t
$$- \frac{k}{\sqrt{- k^{2} t^{2} + 1}}$$
3
-t*k
--------------
3/2
/ 2 2\
\1 - k *t / $$- \frac{k^{3} t}{\left(- k^{2} t^{2} + 1\right)^{\frac{3}{2}}}$$
/ 2 2 \
3 | 3*k *t |
-k *|1 + ---------|
| 2 2|
\ 1 - k *t /
--------------------
3/2
/ 2 2\
\1 - k *t / $$- \frac{k^{3} \left(\frac{3 k^{2} t^{2}}{- k^{2} t^{2} + 1} + 1\right)}{\left(- k^{2} t^{2} + 1\right)^{\frac{3}{2}}}$$