sin²70°怎么化简

来源：学生作业帮助网编辑：六六作业网时间：2024/11/18 02:34:13

sin²70°怎么化简sin²70°怎么化简sin²70°怎么化简sin²70°=(1-cos140°)/2=1/2+1/2*cos40°

sin²70°怎么化简
sin²70°怎么化简

sin²70°怎么化简
sin²70°
=(1-cos140°)/2
=1/2+1/2*cos40°