m=(sinx)/sin(y-z),n=(siny)/sin(z-x),p=(sinz)/sin(x-y),求mn+np
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
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
求函数z=sinx+siny+sin(x+y)(0
将sinx+siny+sinz-sin(x+y+z)化为积的形式
证明sin(x+y)sin(x-y)=(sinx)^2-(siny)^2.
证明sin(x+y)sin(x-y)=sinx-siny
z=sinx/sin(x+y)偏导怎么求?
求sin(x+y)=sinx+siny的导数
已知A(cos x,sin x)B(cos y,sin y)(cos z,sinz)O为原点.
sinx+siny+sinz=0,cosx+cosy+cosz=0,求cos(y-z)的值.