作业帮sin15°/sin5°-cos15°/cos5°=
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/10 06:19:30
sin15°/sin5°-cos15°/cos5°=
sin15°/sin5°-cos15°/cos5°=
sin15°/sin5°-cos15°/cos5°=
sin15cos5/sin5cos5-cos15sin5/cos5sin5
=sin(15-5)/0.5sin10=2
sin15°/sin5°-cos15°/cos5°
= (sin15°cos5°-cos15°sin5°)/sin5°cos5°
=sin(15-5)°/(1/2sin10°)
=1/2 *sin10°/sin10°
=1/2
sin20度=sin15度cos5度-cos15度sin5度 cos20度=cos15度cos5度-sin15度sin5度所以 (sin15度cos5度-sin20度)/(cos15度cos5度-cos20度) =ctan
sin15°/sin5°-cos15°/cos5°=
化简sin15°-cos15°/sin15°+cos15°
(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