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Diberikan fungsi $f(x,y)=\\begin{cases} \\frac{1}{\\sqrt{4-(x-\\var{a})^2-(y-\\var{b})^2}}, & x>0 \\\\ \\frac{1}{\\sqrt{4-(x+\\var{b})^2-(y+\\var{a})^2}}, & x\\leq 0 \\end{cases}$.

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Daerah asal dari fungsi tersebut berbentuk $\\ldots$.

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