sin²48°+sin²42°=?

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 19:00:10
sin²48°+sin²42°=?

sin²48°+sin²42°=?
sin²48°+sin²42°=?

sin²48°+sin²42°=?
=sin²48°+sin²42°
=sin²48°+cos²48°
=1