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12-18-2016, 11:34 PM
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#1
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12-21-2016, 11:55 PM
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#2
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12-22-2016, 05:41 PM
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#3
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12-22-2016, 05:45 PM
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#4
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12-23-2016, 12:49 AM
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#5
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12-23-2016, 11:10 AM
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#6
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12-23-2016, 01:59 PM
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#7
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{ a) when a=0 ...s={-ifn , inf
{ } = b) when a=0 ...s
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12-23-2016, 01:52 PM
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#8
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12-23-2016, 02:23 PM
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#9
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12-26-2016, 10:05 PM
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#10
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$9)a:x>\frac{1}{3}\Rightarrow S1=(\frac{1}{3},\infty )$
$x>-3\Rightarrow S2=(-3,\infty )$
$S1\bigcap S2=(\frac{1}{3},\infty )$
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12-26-2016, 10:37 PM
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#11
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$b:2x<\pi \Rightarrow x<\frac{\pi }{2} \Rightarrow S1=(-\infty,\frac{\pi }{2} )$
$-x>-1.6\Rightarrow x<1.6 \Rightarrow S2=(-\infty,1.6 )$
$
S1\bigcap S2=(-\infty,\frac{\pi }{2} )$
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12-26-2016, 10:57 PM
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#12
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$d:x\geqslant -\frac{2}{3} \ \Rightarrow S1=[-\frac{2}{3},\infty )$
$x<-\sqrt{5}\Rightarrow S2=(-\infty,-\sqrt{5} )$
$S1\bigcap S2=\phi $
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