已知cos(x-y)cosx+sin(x+y)sinx=m.且y为第三象限角,求siny?
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 22:39:14
x){}KЭ|Ȯ. h
\';T>ٱ5Ovtظ /Oy &HPu@@S4mA q.H3H^Hh ӴAj@R`Ovt=tvj4&jkxPmd! k+msg
Ov/j=cgN#NF-1 1F 1 ̸a
已知cos(x-y)cosx+sin(x+y)sinx=m.且y为第三象限角,求siny?
已知cos(x-y)cosx+sin(x+y)sinx=m.且y为第三象限角,求siny?
已知cos(x-y)cosx+sin(x+y)sinx=m.且y为第三象限角,求siny?
cos(x-y)=cosxcosy-sinxsiny sin(x+y)=sinxcosy+cosxsiny
上式左边=(cosx)^2cosy-sinxcosxsiny+(sinx)^2cosy+sinxcosxsiny
=cosy=m
所以,siny=+-(1-m^2)^(1/2) 因为y为第三象限角,所以siny为负
所以,siny=-(1-m^2)^(1/2)
cos(x+y)sinx-sin(x+y)cosx
已知Sin(x+y)Cosx-Cos(x-x)Sinx=3/5求tan2y的值
已知sin(x-y)cosx-cos(x-y)sinx=3/5求tan2y的值
化简sin(x+y)sinx+cos(x+y)cosx
化简sin(x+y)sinx+cos(x+y)cosx等于?
化简cos(x+y)sinx-sin(x+y)cosx
化简cos(x+y)sinx-sin(x+y)cosx
sinx*sin(x+y)+cosx*cos(x+y)等于?
已知sin(x-y)cosx-cos(y-x)sinx=3分之5,y是第三象限角,求sin(y+5π分之4)的值
y= sin x cos x+sinx+cosx的值域
Y= SIN X - COS X / 2 COSX 的导数Y= SIN X - COS X / 2 COSX 的导数
cos(x+y)*cos(x-y)=cos*cosx+sin*siny
求y=sin(cosx)的导数.RT.已知f(x)=sin(cosx),求导.
已知cos(x-y)cosx+sin(x+y)sinx=m.且y为第三象限角,求siny?
cos(x+y)-cosx如何等于-2sin[(2x+y)/2]sin(y/2),
已知sinx+siny=1/3,cosx-cosy=1/5,求cos(x+y),sin(x-y).求过程!
已知cos(x-y)cosx+sin(x-y)sinx=3/5,则cosy的值为
已知sin(x-y)cosx-cos(x-y)sinx=五分之三求tan2y的值