cos(5π/6+x)-sin^2(x-π/6)=cos〔π-(π/6-x)〕-〔1-cos^2(x-π/6)〕=-cos(π/6-x)-〔1-cos^2(x-π/6)〕=-cos(π/6-x)-〔1-cos^2(π/6-x)〕cos(π/6-x)=√3/3 =-√3/3-〔1-(√3/3)^2)=-√3/3-1+1/3=-√3/3--2/3...
cos(π/6-x)=根号下3/3,求cos(5π/6+x)-sin^2(x-π/6)
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