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下列函数中,周期为π,且在上为减函数的是( ) A. B. C. D.
下列函数中,周期为π,且在
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上为减函数的是( )
A.
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B.
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C.
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D.
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函数f(x)=3cos2x-4sinxcosx的最小正周期为( )
A.
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B.
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C.π
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角α的终边经过点P(x,-
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)(x≠0),且cosα=
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x,则sinα等于( )
A.
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B.
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C.
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D.-
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已知椭圆C:
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,短轴一个端点到右焦点的距离为
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.
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