(sin15°－cos15°)/(sin15°+cos15°)=
来源：学生作业帮助网 编辑：六六作业网 时间：2025/01/30 15:59:17
(sin15°－cos15°)/(sin15°+cos15°)=(sin15°－cos15°)/(sin15°+cos15°)=(sin15°－cos15°)/(sin15°+cos15°)=(sin
(sin15°－cos15°)/(sin15°+cos15°)=
(sin15°－cos15°)/(sin15°+cos15°)=
(sin15°－cos15°)/(sin15°+cos15°)=
(sin15°－cos15°)/(sin15°+cos15°)【分子分母同乘上sin15°+cos15°】
=【（sin15)^2-(cos15)^2】/【1+2sin15cos15】
=-cos30/[1+sin30]
=-(根号3/2)/(1+1/2)
=-根号3 /3
原式=sin²15-cos²15
=-(cos²15-sin²15)
=-cos(2×15)
=-cos30
=-√3/2
(sin15°－cos15°)/(sin15°+cos15°)=
化简sin15°-cos15°/sin15°+cos15°
sin15°-cos15°/sin15°+cos15°的值?
化简sin15°-cos15°/sin15°+cos15°
sin15°-cos15°/sin15°+cos15°的值?
sin15°cos15°等于
sin15°+cos15°过程
sin15°cos15°等于?
化简：sin15°*cos15°
cos15°-sin15°=?
sin15°cos15°=
sin15°cos15°是什么意思
sin15°+cos15°=
求cos15°-tan15°/cos15°+sin15°
化简（sin15 °+cos15°）2
sin15°=?cos15°=?
求sin15°+cos15°的值
sin15°cos15°怎么算