设函数f(x)属于区间[0,π/2],且f(0)f(π/2)

问题描述:

设函数f(x)属于区间[0,π/2],且f(0)f(π/2)
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题目的表述应该是f(x)在[0,π/2]上连续,而非f(x)∈[0,π/2],否则f(0)*f(π/2)