cos20-cos40-cos80

来源：学生作业帮助网 编辑：六六作业网 时间：2024/07/08 19:53:53
cos20-cos40-cos80cos20-cos40-cos80cos20-cos40-cos80cos20-cos40-cos80=cos20-cos(60-20)-cos(60+20)=cos

cos20-cos40-cos80
cos20-cos40-cos80

cos20-cos40-cos80
cos20-cos40-cos80
=cos20-cos(60-20)-cos(60+20)
=cos20-cos60cos20-sin60sin20-cos60cos20+sin60sin20
=cos20-2cos60cos20
=cos20-2*1/2*cos20
=0

cos20'cos40'cos80'等于? cos20*cos40*cos80=? cos20-cos40-cos80 cos20*cos40*cos80等于多少 求cos20×cos40×cos60×cos80 cos20°-cos40°-cos80°= cos20度*cos40度*cos80度=? cos20度cos40度cos80度 cos20度*cos40 度*cos80 度＝? cos20度-cos40度-cos80度等于? cos20°cos40°cos80°=? 求值cos20度*cos40度*cos80度 计算cos20°cos40°cos80° 如何化简“(COS20度)*(COS40度)*(COS80度)“? Cos20度*Cos40度*Cos80度化简求值求详解,是 化简cos20°-cos40°-cos80°等于? 化简cos20°cos40°cos60°cos80° cos20度cos40度cos80度得值为?