若函数f（x）=2sin2x（-π/4≤x≤α）存在反函数,求实数α的取值范围
人气：258 ℃ 时间：2019-08-19 19:55:54
解答
-π/4≤x≤α
-π/2≤2x≤2α≤π/2
-π/4
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