1、兩角和公式:sin(A+B)=sinAcosB+cosAsinBsin(A-B)=sinAcosB-sinBcosAcos(A+B)=cosAcosB-sinAsinBcos(A-B)=cosAcosB+sinAsinBtan(A+B)=(tanA+tanB)/(1... [详细]
1、積化和差公式:sinαsinβ=-[cos(α+β)-cos(α-β)]/2,cosαcosβ=[cos(α+β)+cos(α-β)]/2,sinαcosβ=[sin(α+β)+sin(α-β)]/2,cosαsinβ=[sin... [详细]
1、Itisimportant或essential或crucial或significantforsomeonetodo...對某人來說,做某事是重要的例句:Itisvitalforhumanbeingstotakeimmediateactionto... [详细]
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