Cari nilai x
\left\{\begin{matrix}\\x=y^{2}-2\text{, }&\text{unconditionally}\\x=\frac{2^{\frac{4}{5}}\left(2-y^{2}\right)}{2}\text{, }&|y|=\sqrt{2}\end{matrix}\right,
Cari nilai y
y=\sqrt{x+2}
y=-\sqrt{x+2}\text{, }x\geq -2
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