Evaluate
-\frac{\ln(|1-3x-3x^{2}|)}{2}-\frac{6\sqrt{21}\ln(\frac{|2x+1-2\sqrt{21}|}{|2x+2\sqrt{21}+1|})}{7}+С
Differentiate w.r.t. x
\frac{3\left(48\sqrt{21}sign(2x+1-2\sqrt{21})x^{3}+72\sqrt{21}sign(2x+1-2\sqrt{21})x^{2}-24\sqrt{21}|2x+1-2\sqrt{21}|x^{2}+28|2x+1-2\sqrt{21}|x^{2}+1008sign(2x+1-2\sqrt{21})x^{2}+4\sqrt{21}x|2x+1-2\sqrt{21}|+8\sqrt{21}xsign(2x+1-2\sqrt{21})+28x|2x+1-2\sqrt{21}|+1008xsign(2x+1-2\sqrt{21})+22\sqrt{21}|2x+1-2\sqrt{21}|-8\sqrt{21}sign(2x+1-2\sqrt{21})+7|2x+1-2\sqrt{21}|-336sign(2x+1-2\sqrt{21})\right)}{14|2x+1-2\sqrt{21}|\left(2x+2\sqrt{21}+1\right)\left(1-3x-3x^{2}\right)}
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