The first derivative
[src]
____
\/ 21
-----------------
__________
/ 2
/ 3*x
7* / 1 - ----
\/ 7
$$\frac{\sqrt{21}}{7 \sqrt{1 - \frac{3 x^{2}}{7}}}$$
The second derivative
[src]
____
3*x*\/ 21
----------------
3/2
/ 2\
| 3*x |
49*|1 - ----|
\ 7 /
$$\frac{3 \sqrt{21} x}{49 \left(1 - \frac{3 x^{2}}{7}\right)^{\frac{3}{2}}}$$
The third derivative
[src]
/ 2 \
____ | 9*x |
3*\/ 21 *|7 + --------|
| 2|
| 3*x |
| 1 - ----|
\ 7 /
-----------------------
3/2
/ 2\
| 3*x |
343*|1 - ----|
\ 7 /
$$\frac{3 \sqrt{21} \left(\frac{9 x^{2}}{1 - \frac{3 x^{2}}{7}} + 7\right)}{343 \left(1 - \frac{3 x^{2}}{7}\right)^{\frac{3}{2}}}$$