求(sin15°-cos15°)/(sin15°+cos15°)的值
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求(sin15°-cos15°)/(sin15°+cos15°)的值求(sin15°-cos15°)/(sin15°+cos15°)的值求(sin15°-cos15°)/(sin15°+cos15°)
求(sin15°-cos15°)/(sin15°+cos15°)的值
求(sin15°-cos15°)/(sin15°+cos15°)的值
求(sin15°-cos15°)/(sin15°+cos15°)的值
分子分母同时乘以sin15°-cos15°
原式
=(sin15°-cos15°)/(sin15°+cos15°)
=(sin15°-cos15°)²/(sin²15°-cos15²°)
=(sin²15°-2*sin15°cos15°+cos²15°)/(-cos(2*15°))
=(1-sin30°)/(-cos30°)
=(1-1/2)/(-√3/2)
=-√3/3
求(sin15°-cos15°)/(sin15°+cos15°)的值
求cos15°-tan15°/cos15°+sin15°
求sin15°+cos15°的值
化简(sin15 °+cos15°)2
(sin15°+cos15°)(sin15°-cos15°)的值为?
(sin15°+ cos15°)/(sin15°- cos15°)的值是
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