Evaluate
\frac{\left(3x+1\right)e^{3x}}{\arctan(xe^{3x})\left(x^{2}e^{6x}+1\right)}
Differentiate w.r.t. x
\frac{e^{3x}\left(-9x^{3}e^{6x}\arctan(xe^{3x})-6x^{2}e^{6x}\arctan(xe^{3x})-2xe^{6x}\arctan(xe^{3x})+9x\arctan(xe^{3x})+6\arctan(xe^{3x})-9x^{2}e^{3x}-6xe^{3x}-e^{3x}\right)}{\left(\arctan(xe^{3x})\left(x^{2}e^{6x}+1\right)\right)^{2}}
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