作业帮sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简 sin(x+105°)cos(x-15°)-cos(x+105°)sin(x-15°)
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/01 23:54:00
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sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简 sin(x+105°)cos(x-15°)-cos(x+105°)sin(x-15°)
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简
sin(x+105°)cos(x-15°)-cos(x+105°)sin(x-15°)
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简 sin(x+105°)cos(x-15°)-cos(x+105°)sin(x-15°)
根据公式sin（a-b）=sinacosb-cosasinb
所以原式=sin(x+105-x+15）=sin120°=√3/2
利用公式sin(a+b)=sina cosb + cosa sinb
原式等于sin(x-15+x+15)=sin2x
最后答案应该等于1/2
无语，你题目不完整，sin后面居然空白
cos(105度‐×）
是不是sin后面还有一个（x-15°）如果是的话，答案是sin60°
打开哈克挥发分客户发挥空间哈的空间哈弗可好看
sin(x+105°)cos(x-15°)-cos(x+105°)sin求化简 sin(x+105°)cos(x-15°)-cos(x+105°)sin(x-15°)
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cos(27°+x)sin(57°+x)-sin(207°+x)sin(327°+x)
sin(x+15°)=1/3 则cos(x+105°)=?
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为什么cos(20°+x) = sin(70°-x)cos(25°-x) = -cos(155°+x)?这两步没怎么看懂.cos(20+x)cos(25-x)-sin(20-x)sin(25-x)cos(20+x)cos(25-x)-sin(20+x)sin(25-x)20，25都是度数
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cos x/sin x+sin x/(1+cos x) 化简.
sin（sin（sin（sin（x）=cos（cos（cos（cos（x）,X等于多少?
cos x /sin x=
cos(x+27°)cos(18°-x)-sin(18°-x)sin(x+27°)=cos(x+27°)cos(18°-x)+cos[90°-(60°-x)]sin(x-18°)原本是-sin(18°-x)负号怎么变成的+cos[90°-(60°-x)] cos前的负号