证明sin(2a+p)/sina-2cos(a+p)=sinp/sina

分类: 作业答案 • 2022-04-04 18:48:35

问题描述：

答

sin(2a+p)/sina-2cos(a+p)
= (sin2acosp+cos2asinp) / sina - 2cosacosp+2sinasinp
= 2cosacosp + (1-2sina^2)sinp/sina - 2cosacosp+2sinasinp
= sinp/sina