sinX+sinY+sinZ=0 同时满足cosX+cosY+cosZ=0
sinx+siny+sinz=0;cosx+cosy+cosz=0;求cos(x-y)
已知sinx+siny+sinz=0,cosx+cosy+cosz=0 则cos(x-y)=______ 要详解
sinx+siny+sinz=0,cosx+cosy+cosz=0,求cos(y-z)的值.
已知sinx+siny+sinz=cosx+cosy+cosz=0,求tan(x+y+z)+tanxtanytanz的值
已知sinx+siny+sinz=0,cosx+cosy+cosz=0,求证cos(x-y)=cos(y-z)=cos(
已知x,y,z均为锐角,且sinx+sinz=siny,cosx-cosz=cosy,求x-y的值.
若a不等于0,且sinx+siny+a,cosx+cosy=阿尔法,则sinx+cosx=
设向量a=(cosx,sinx)b=(cosy,siny),其中0
若a≠0且sinx+siny=a,cosx+cosy=a,则sinx+cosx=______.
满足cosx*cosy-sinx*siny=1/2的角xy有可能哪些
已知向量a( cosx,sinx)b(cosy ,siny)(0
已知{1+cosx-siny+sinxsiny=0,1-cosx-cosy+sinxcosy=0,求sinx的值.