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Select equivalent expressions AND solve. x+\frac{x+2}{x^{2}+2}+\frac{2}{x^{2}+2}+\frac{1}{x+2}+2=\frac{x^{3}+2 x^{2}+3 x+6}{x^{2}+2} \mathbf{A}\left[x=-\frac{1}{2} \sqrt{21}-\frac{3}{2}, x=\frac{1}{2} \sqrt{21}-\frac{3}{2}\right] \mathbf{B}[x=(-3 i+1), x=(3 i+1)] \text { C }[x=-i \sqrt{5}-1, x=i \sqrt{5}-1] Dnone of these

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