首页 > 留学知识库

问题: 求1/cos80-√3/sin80=

解答:

1/cos80-√3/sin80
=[sin80 -(√3)cos80]/(sin80cos80)
=2[(1/2)sin80 -(√3/2)cos80]/(sin80cos80)
=2sin(80 -60)]/(sin80cos80)
=4sin20/(2sin80cos80)
=4sin20/sin160
=4