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参考公式三角函数的积化和差公式sinαcosβ=(1/2)[sin(α+β)+sin(α-β)],cosαsinβ=(1/2)[sin(α+β)-sin(α-β)], cosαcosβ=(1/2)[cos(α+β)+cos(α-β)],sinαsinβ=(1/2)[cos(α+β)-cos(α-β)]. 正棱台、圆台的侧面积公式:
Reference Formula The product of trigonometric functions and the difference formula sinαcosβ=(1/2)[sin(α+β)+sin(α-β)], cosαsinβ=(1/2)[sin(α+β)-sin( Α-β)], cosαcosβ=(1/2)[cos(α+β)+cos(α-β)], sinαsinβ=(1/2)[cos(α+β)-cos(α-β) ]. Formula for the lateral area of positive rib table and round table: