Đặt \(x=a;\sqrt{4-x^2}=b\Rightarrow a^2+b^2=4\)
pt <=> \(b+a=2+3ab\Leftrightarrow a^2+2ab+b^2=4+12ab+9a^2b^2\)
<=> \(4+2ab=4+12ab+9a^2b^2\)
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