2 7
-3 - 3*cot (a) + ----------- + 9*cos(a)
________
/ 2
\/ 1 - a
$$9 \cos{\left(a \right)} - 3 \cot^{2}{\left(a \right)} - 3 + \frac{7}{\sqrt{1 - a^{2}}}$$
/ 2 \ 7*a
-9*sin(a) + 6*\1 + cot (a)/*cot(a) + -----------
3/2
/ 2\
\1 - a /
$$\frac{7 a}{\left(1 - a^{2}\right)^{\frac{3}{2}}} + 6 \left(\cot^{2}{\left(a \right)} + 1\right) \cot{\left(a \right)} - 9 \sin{\left(a \right)}$$
2 2
/ 2 \ 7 2 / 2 \ 21*a
-9*cos(a) - 6*\1 + cot (a)/ + ----------- - 12*cot (a)*\1 + cot (a)/ + -----------
3/2 5/2
/ 2\ / 2\
\1 - a / \1 - a /
$$\frac{21 a^{2}}{\left(1 - a^{2}\right)^{\frac{5}{2}}} - 6 \left(\cot^{2}{\left(a \right)} + 1\right)^{2} - 12 \left(\cot^{2}{\left(a \right)} + 1\right) \cot^{2}{\left(a \right)} - 9 \cos{\left(a \right)} + \frac{7}{\left(1 - a^{2}\right)^{\frac{3}{2}}}$$