已知函数f(x)=sin(2x+π/6)+sin(2x—π/6)—cos2x+4,已知f(α)=5,求tanα的值（要具

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/14 06:36:19

已知函数f(x)=sin(2x+π/6)+sin(2x—π/6)—cos2x+4,已知f(α)=5,求tanα的值（要具体过程）
注：该化简结果是：f(x)=2sin(2x+π/6)+4,tanα=0或根号3（请问具体过程是什么?）

f(x)=sin(2x+π/6）+sin2xcosπ/6+cos2xsinπ/6-cos2x+4
=sin(2x+π/6）+sin2xcosπ/6+cos2x*1/2-cos2x+4
=sin(2x+π/6）+sin2xcosπ/6-cos2x*1/2+4
=sin(2x+π/6)+sin2xcosπ/6-cos2xsinπ/6+4
=sin(2x+π/6)+sin(2x+π/6)+4
=2sin(2x+π/6)+4
所以2sin(2α+π/6)+4=5
sin(2α+π/6)=1/2
2α+π/6=2kπ+π/6,2α+π/6=2kπ+5π/6
α=kπ,α=kπ+π/3
tanα=0或根号3

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