试题与答案

已知向量a=(cosα,-2),b=(sinα,1),且a∥b,则tan(α-π

题型:选择题

题目:

已知向量
a
=(cosα,-2),
b
=(sinα,1),且
a
b
,则tan(α-
π
4
)等于(  )
A.3B.-3C.
1
3
D.-
1
3

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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