sin15°-cos15°/sin15°+cos15°的值?
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sin15°-cos15°/sin15°+cos15°的值?sin15°-cos15°/sin15°+cos15°的值?sin15°-cos15°/sin15°+cos15°的值?(sin15°-co
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°=?