(sin15度+cos15度+1)(sin15度+cos15度-1)

来源:学生作业帮助网 编辑:六六作业网 时间:2025/01/31 12:11:08
(sin15度+cos15度+1)(sin15度+cos15度-1)(sin15度+cos15度+1)(sin15度+cos15度-1)(sin15度+cos15度+1)(sin15度+cos15度-

(sin15度+cos15度+1)(sin15度+cos15度-1)
(sin15度+cos15度+1)(sin15度+cos15度-1)

(sin15度+cos15度+1)(sin15度+cos15度-1)
原式=(sin15+cos15)^2-1
=1+sin30-1
=sin30
=1/2

拆开就是sin30度=0.5