字典翻译 问答 小学 数学 【三角函数y=2sin(1/2x+π/3)-cos(1/2x-π/6)周期怎么求?】
问题标题:
【三角函数y=2sin(1/2x+π/3)-cos(1/2x-π/6)周期怎么求?】
问题描述:

三角函数y=2sin(1/2x+π/3)-cos(1/2x-π/6)周期怎么求?

潘俊民回答:
  y=2sin(1/2x+π/3)-cos(1/2x-π/6)   =2sin1/2xcosπ/3+2cos1/2xsinπ/3-cos1/2xcosπ/6-sin1/2xsinπ/6   =sin1/2x+cos1/2x*√3-cos1/2x*√3/2-sin1/2x*1/2   =sin1/2x*1/2+cos1/2x*√3/2   =sin1/2xcosπ/3+cos1/2xsinπ/3   =sin(1/2x+π/3)   所以T=2π/(1/2)=4π
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