已知a*sin(x-y)=sinx-siny.其中a>1.
证明sin(x+y)sin(x-y)=sinx-siny
已知向量a=(cosx,sinx),向量b=(cosy,siny),其中0<x<y<π.
求函数z=sinx+siny+sin(x+y)(0
求sin(x+y)=sinx+siny的导数
已知sinx+siny=1/3,cosx-cosy=1/5,求cos(x+y),sin(x-y).
已知sinx-siny=1/2,cosx-cosy=1/2,x、y均为锐角,求sin(x-y)
证明 [sin(2x+y)/sinx]-2cos(x+y)=siny/sinx
求证:sin(2x+y)/sinx-2cos(x+y)=siny/sinx
证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+
证明sin(x+y)sin(x-y)=(sinx)^2-(siny)^2.
求下列导数:sin(x+y)=sinx+siny e^x+x=e^y+y
已知x,y,z属于(0,派/2),sin^2x+sin^2y+sin^2z=1,求(sinx+siny+sinz)/(c