$(a)\;(0,\large\frac{1}{2})\qquad(b)\;[\large\frac{1}{2},\large\frac{1}{\sqrt{2}})\qquad(c)\;[\large\frac{1}{\sqrt{2}},\normalsize \sqrt{2}]\qquad(d)\;(\sqrt{2} , \infty)$

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