已知向量a=(x,1),b=(1,-sinx),函数f(x)=a•b.(1)若x 发布时间:2017-05-13 19:11 │ 来源:www.tikuol.com 题型:解答题 问题: 已知向量a=(x,1),b=(1,-sinx),函数f(x)=a•b.(1)若x∈[0,π],试求函数f(x)的值域;(2)若θ为常数,且θ∈(0,π),设g(x)=2f(θ)+f(x)3-f(2θ+x3),x∈[0,π],请讨论g(x)的单调性,并判断g(x)的符号.
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