对任意实数x,化简sinx+sin(x+2/3派)+sin(x+4/3派）=?
人气：307 ℃ 时间：2020-08-27 02:10:55
解答
sinx+sin(x+2π/3)+sin(x+4π/3)=sinx+sin(x+2π/3)+sin(x+2π/3)cos(2π/3)+sin(2π/3)cos(x+2π/3)=sinx+sin(x+2π/3)-(1/2)sin(x+2π/3)+(√3/2)cos(x+2π/3)=sinx+(1/2)sin(x+2π/3)+(√3/2)cos(x+2π/3)=sinx+s...
推荐
猜你喜欢
