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已知α为第三象限角,且,则的值为( ) A. B.±2 C.2 D.-2
已知α为第三象限角,且
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,则
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的值为( )
A.
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B.±2
C.2
D.-2
考点分析:
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C.
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D.-
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已知A、B两点在抛物线C:x
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.
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;
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