cos150度等于几分之几
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cos150度等于几分之几
cos150度等于几分之几
cos150度等于几分之几
cos150=cos(90+60)=cos90*cos60-sin90*sin60=0-根号3/2=-根号3/2
负二分之根号三
解 cos(5π/6)=cos(π-π/6)=-cos(π/6)=-√3/2
cos150度等于几分之几
cos150度等于几分之几
cos150度等于几分之几
cos150=cos(90+60)=cos90*cos60-sin90*sin60=0-根号3/2=-根号3/2
负二分之根号三
解 cos(5π/6)=cos(π-π/6)=-cos(π/6)=-√3/2