将sinx+siny+sinz-sin(x+y+z)化为积的形式
将sinx+siny+sinz-sin(x+y+z)化为积的形式
将sinx+siny+sinz-sin(x+y+z)化为积的形式
三角不等式证明证明sin(x+y)+sin(y+z)+sin(z+x)>sinx+siny+sinz+sin(x+y+z
证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+
已知x,y,z属于(0,派/2),sin^2x+sin^2y+sin^2z=1,求(sinx+siny+sinz)/(c
已知sinx+siny+sinz=cosx+cosy+cosz=0,求tan(x+y+z)+tanxtanytanz的值
已知x,y,z均为锐角,且sinx+sinz=siny,cosx-cosz=cosy,求x-y的值.
求函数z=sinx+siny+sin(x+y)(0
均值不等式的疑问x+y+z = pi ,求 sinx+siny+sinz 的最大值这题用和差化积做是(3/2)*根号2,
sinx+siny+sinz=0,cosx+cosy+cosz=0,求cos(y-z)的值.
已知sinx+siny+sinz=0,cosx+cosy+cosz=0,求证cos(x-y)=cos(y-z)=cos(
求sin(x+y)=sinx+siny的导数