sin15°-cos15°/sin15°+cos15°的值?

来源：学生作业帮助网编辑：作业帮时间：2024/05/03 16:22:26

sin15°-cos15°/sin15°+cos15°的值?
sin15°-cos15°/sin15°+cos15°的值?

sin15°-cos15°/sin15°+cos15°的值?
(sin15°-cos15)°/(sin15°+cos15°)
=(tan15°-1)/(tan15°+1)
=(tan15°-tan45°)/(tan45°tan15°+1)
=tan(15°-45°)
=-tan30°
=-√(3)/3

sin15°-cos15°/sin15°+cos15°
=sin15°cos45°-cos15°sin45°/sin15°sin45°+cos15°cos45°
=sin(15-45°)/cos(15-45)
=-tan30°
=-根号3/3

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°= 化简（sin15 °+cos15°）2 sin15°=?cos15°=? 求sin15°+cos15°的值 sin15°cos15°怎么算计算：cos15°sin15°=?