作业帮化简sin10sin30sin50sin70
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/26 19:37:20
化简sin10sin30sin50sin70
化简sin10sin30sin50sin70
化简sin10sin30sin50sin70
sin10sin30sin50sin70
= 1/2 * sin10 * sin50 * sin70
=1/2 * sin10 * cos20 * cos 40
=1/2 * cos10 * sin10 * cos20 * cos 40 / cos10
=1/4 * sin20 * cos20 * cos40 / cos10
=1/8 * sin40 * cos40 / cos10
=1/16 * sin80 / cos10
=1/16 * cos10 / cos10
=1/16