试题与答案

设两个向量a=(λ+2,λ2-cox2α)和b=(m,m2+sinα),其中λ,

题型:填空题

题目:

设两个向量
a
=(λ+2,λ2-cox2α)和
b
=(m,
m
2
+sinα),其中λ,m,α为实数.若
a
=2
b
,则
λ
m
的取值范围是______.

答案:

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解:如图所示:。

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