三角函数题.
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三角函数题.三角函数题. 三角函数题.cos(-16π/3)+sin(-16π/3)=cos(-6π+2π/3)+sin(-6π+2π/3)=cos(2π/3)+sin(2π/3)=cos(
三角函数题.
三角函数题.
三角函数题.
cos(-16π/3)+sin(-16π/3)=cos(-6π+2π/3)+sin(-6π+2π/3)
=cos(2π/3)+sin(2π/3)=cos(π-π/3)+sin(π-π/3)
=-cos(π/3)+sin(π/3)
=-1/2+√3/2
=（√3-1）/2