ແກ້ສຳລັບ f (complex solution)
f=e^{\frac{Im(x)arg(\left(x^{2}-4\right)\left(x^{2}+2x-1\right))+iRe(x)arg(\left(x^{2}-4\right)\left(x^{2}+2x-1\right))}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}-\frac{2\pi n_{1}iRe(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}-\frac{2\pi n_{1}Im(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}}\left(|x-2||x+2||x^{2}+2x-1|\right)^{\frac{Re(x)-iIm(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}}
n_{1}\in \mathrm{Z}
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