Question

正弦正切的计算公式，学霸！！！

Answer 1

 

Answer 2

Sin(A+B)=SinA*CosB+SinB*CosA
Sin(A-B)=SinA*CosB-SinB*CosA
Cos(A+B)=CosA*CosB-SinA*SinB
Cos(A-B)=CosA*CosB+SinA*SinB
Tan(A+B)=(TanA+TanB)/(1-TanA*TanB)
Tan(A-B)=(TanA-TanB)/(1+TanA*TanB

sin(2α)=2sinα·cosα=2/(tanα+cotα)
cos(2α)=cos^2(α)-sin^2(α)=2cos^2(α)-1=1-2sin^2(α)
tan(2α)=2tanα/[1-tan^2(α)]

Answer 3

 

Answer 4

 

追答

完整的马上出来

 

哪里不懂再问我

Answer 5

sina＝y／r tana＝y／x r＝x平方＋y平方。