问题
解答题
求sin
|
答案
sin
•sinπ 12
=sin5π 12
•sin(π 12
-π 2
)=sinπ 12
cosπ 12
=π 12
sin1 2
=π 6
.．1 4
搜题请搜索小程序“爱下问搜题”
求sin
|
sin
•sinπ 12
=sin5π 12
•sin(π 12
-π 2
)=sinπ 12
cosπ 12
=π 12
sin1 2
=π 6
.．1 4