/ 2 / 2 3*x \\
3*|------------- + 3*x*|- --------------------- + -------------||
| __________ | / 2\ 3/2||
| / 2 | \-1 + 9*x /*acos(3*x) / 2\ ||
\\/ 1 - 9*x \ \1 - 9*x / //
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2
acos (3*x)
$$\frac{3 \left(3 x \left(\frac{3 x}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}}} - \frac{2}{\left(9 x^{2} - 1\right) \operatorname{acos}{\left(3 x \right)}}\right) + \frac{2}{\sqrt{1 - 9 x^{2}}}\right)}{\operatorname{acos}^{2}{\left(3 x \right)}}$$
/ / 2 \ \
| | 1 6 27*x 18*x | 2 3*x |
27*|x*|------------- + ------------------------ + ------------- + ----------------------| - --------------------- + -------------|
| | 3/2 3/2 5/2 2 | / 2\ 3/2|
| |/ 2\ / 2\ 2 / 2\ / 2\ | \-1 + 9*x /*acos(3*x) / 2\ |
\ \\1 - 9*x / \1 - 9*x / *acos (3*x) \1 - 9*x / \-1 + 9*x / *acos(3*x)/ \1 - 9*x / /
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2
acos (3*x)
$$\frac{27 \left(x \left(\frac{27 x^{2}}{\left(1 - 9 x^{2}\right)^{\frac{5}{2}}} + \frac{18 x}{\left(9 x^{2} - 1\right)^{2} \operatorname{acos}{\left(3 x \right)}} + \frac{1}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}}} + \frac{6}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}} \operatorname{acos}^{2}{\left(3 x \right)}}\right) + \frac{3 x}{\left(1 - 9 x^{2}\right)^{\frac{3}{2}}} - \frac{2}{\left(9 x^{2} - 1\right) \operatorname{acos}{\left(3 x \right)}}\right)}{\operatorname{acos}^{2}{\left(3 x \right)}}$$