Integral of $$$i int_{} - \sqrt{1 - x^{2}} - \frac{\sin{\left(x \right)} \tan^{2}{\left(x \right)}}{\cos{\left(3 x \right)} + 3}$$$ with respect to $$$x$$$
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Find $$$\int \left(i int_{} - \sqrt{1 - x^{2}} - \frac{\sin{\left(x \right)} \tan^{2}{\left(x \right)}}{\cos{\left(3 x \right)} + 3}\right)\, dx$$$.
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