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$$\tan^{-1}\left(\dfrac{3a^2x-x^3}{a^3-3ax^2}\right),\;a>0;\; -\frac{a}{\sqrt{3}}\leqslant x \leqslant \frac{a}{\sqrt{3}}$$ Hi, Please help me to solve this problem. As I can solve simple inverse trigonometric functions. Please help hanks in advance.

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