(本小題滿分10分)設(shè)
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,解關(guān)于
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的不等式:
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解:
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或
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……………………..2分
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或
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………① …………………3分
當(dāng)
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時,
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,由①得
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或

…5分
當(dāng)
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時,
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,由①式得
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……………7分
當(dāng)
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時,
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,由①式得
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或
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即
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……9分
綜上,當(dāng)
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時,原不等式解集為
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;當(dāng)
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時,原不等式解集為
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. ……………………………………10分
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
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時,求

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(II)如果對
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.請在下列兩題中任選一題作答,如果兩題都做,則按第一題評分。
A.不等式
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的解集為 。
B.下列方程:①極坐標(biāo)方程:

;②極坐標(biāo)方程:

;
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
(t為參數(shù));④參數(shù)方程:

(

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
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
對任意實數(shù)

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
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
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
在
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方程

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
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