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ans
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024820
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$\sqrt{13}$
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017652
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(1) $(4,2)$; (2) $-\dfrac{4\sqrt{17}}{17}$
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024818
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(1) $-\dfrac{\sqrt{2}}{2}$; (2) $\sqrt{29}$; (3) $-\dfrac{23}{3}$; (4) $(-\dfrac{23}{3},2)\cup (2,+\infty)$
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024819
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(1) $\cos\theta$; (2i) $(0,3)$; (2ii) $2\sqrt{3}-3$
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