cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/21 21:16:19
cos2xcosπ/5+sin2xsinπ/5化简最详细的步骤?cos2xcosπ/5+sin2xsinπ/5化简最详细的步骤?cos2xcosπ/5+sin2xsinπ/5化简最详细的步骤?两角差的
cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
cos2x cosπ/5+sin2x sinπ/5化简最详细的步骤?
两角差的余弦=cos(2x -π/5)
cos2x cosπ/5+sin2x sinπ/5
=cos(2x-π/5)