Ответ (Неопределённый)
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| 1 | 1
| ---------- dx = C - | ---------- dx
| tan(x) - x | x - tan(x)
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$$-{{4\,\int {{{\left(x^2-1\right)\,\sin \left(2\,x\right)+2\,x\,
\cos \left(2\,x\right)}\over{\left(x^4+2\,x^2+1\right)\,\sin ^2
\left(2\,x\right)+\left(-4\,x^3-4\,x\right)\,\sin \left(2\,x\right)+
\left(x^4+2\,x^2+1\right)\,\cos ^2\left(2\,x\right)+\left(2\,x^4-2
\right)\,\cos \left(2\,x\right)+x^4+2\,x^2+1}}}{\;dx}+\log \left(x^2
+1\right)}\over{2}}$$