sin(-2011π/3)的值
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sin(-2011π/3)的值sin(-2011π/3)的值sin(-2011π/3)的值sin(-2011π/3)=-sin(2011π/3)=-sin(670π+π/3)=-sin(π/3)=-√
sin(-2011π/3)的值
sin(-2011π/3)的值
sin(-2011π/3)的值
sin(-2011π/3)
=-sin(2011π/3)
=-sin(670π+π/3)
=-sin(π/3)
=-√3/2
原式=sin（-2011π/3+335×2π)=sin(-2011π/3+2010π/3）=sin（-π/3）=-sin（π/3）=-√3/2
-sin（2011π/3）=-sin(667π+π/3)=sin(π/3)
3^2/2