设函数f(x)=sin(x+π/3)+2sin(x-π/3)-根号3cos(2π/3-x)
问题描述:
设函数f(x)=sin(x+π/3)+2sin(x-π/3)-根号3cos(2π/3-x)
求f(π/6) f(π/3)的值..
求过程,求速度..
答
因为:f(π/6)=sinπ/2+2sin(-π/6)-根号3cos(π/2)=1-1-0=0
所以:f(π/6) f(π/3)=0原式=sin(x+π/3)+√3cos(x+π/3)+2sin(x-π/3)=2[1/2sin(x+π/3)+√3/2cos(x+π/3)]+2sin(x-π/3)=2sin(x+π/3+π/6)+2sin(x-π/3)=2[sin(x+π/2)+sin(x-π/3)]=2(cosx+√3/2sinx-1/2cosx)=2(√3/2sinx+1/2cosx)=2sin(x+π/6)为什么百度上有这个答案。。和你的不一样你看求得是什么?f(π/6)——表示当x=π/6时的函数值f(π/3)——表示当x=π/3时的函数值所以,——当然我这样算是正确的!!亲