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【单选题】
sinαsinβ-cosαcosβ等于（ ）A.
sin（α+β）
B.
cos（α+β）
C.
sin（α-β）
D.
-cos（α+β）
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A.
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B.
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C.
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D.
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E.
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A.
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B.
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C.
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D.
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A.
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B.
错误
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