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已知实数u,v,定义运算u*v=(u-1)v,设u=cosθ+sinθ,v=co...
已知实数u,v,定义运算u*v=(u-1)v,设u=cosθ+sinθ,v=cosθ-sinθ-1,则当
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≤θ≤
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时,u*v是的值域为( )
A.
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B.
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C.[0,4]
D.
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