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    { a) when a=0 ...s={-ifn , inf
    { } = b) when a=0 ...s

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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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    $b:2x<\pi \Rightarrow x<\frac{\pi }{2} \Rightarrow S1=(-\infty,\frac{\pi }{2} )$

    $-x>-1.6\Rightarrow x<1.6 \Rightarrow S2=(-\infty,1.6 )$

    $
    S1\bigcap S2=(-\infty,\frac{\pi }{2} )$

    ; 12-26-2016 10:42 PM

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    $c:x>-1 \ \Rightarrow S1=(-1,\infty )$

    $2x+1\leqslant 5\Rightarrow x\leqslant 2 \Rightarrow S2=(-\infty,2 ]$

    $S1\bigcap S2=(-1,2 ]$

    ; 12-26-2016 10:59 PM

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