sin^2a+2sinacosa-cos^2a化简

来源：学生作业帮助网编辑：作业帮时间：2024/05/09 07:24:19

sin^2a+2sinacosa-cos^2a化简
sin^2a+2sinacosa-cos^2a化简

sin^2a+2sinacosa-cos^2a化简
sin^2a+2sinacosa-cos^2a=2sinacosa-cos2a=sin2a-cos2a