来自盛立的问题
确定下列三角函数的正负号(1)sin168°(2)cos(-600°)(3)tan(-105°)(4)sin(-17π/5)(5)cos(21π/8)(6)tan19π/5
确定下列三角函数的正负号
(1)sin168°
(2)cos(-600°)
(3)tan(-105°)
(4)sin(-17π/5)
(5)cos(21π/8)
(6)tan19π/5
1回答
2020-02-29 23:34