sin15.30.45.60.75.90.105.120.135.150.165.180 cos15…90… ten15
sin15.30.45.60.75.90.105.120.135.150.165.180 cos15…90… ten15
求cos15°-tan15°/cos15°+sin15°
sin15+cos15为什么等于 根号2*sin60?
sin6+cos15*sin9/cos6-sin15*sin9
(cos15度—sin15度)/(cos15度+sin15度)
求sin15,sin75,cos15,cos75,tan15,tan75的准确值
tan15°+cos15°/sin15°的值 求详解
COS15度SIN105度减COS75度SIN15度 等于多少
sin15度cos15度的值是?如题
sin15度×cos15度×cos30度 的值
求sin15°+tan30°cos15°的值
(cos15°-cos75°)(sin75°+sin15°)=?