证明sin(x+y)sin(x-y)=sinx-siny
证明sin(x+y)sin(x-y)=sinx-siny
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.
证明 [sin(2x+y)/sinx]-2cos(x+y)=siny/sinx
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
请问,如何证明sinx+siny=2*sin(x+y/2)*cos(x-y/2)
证明cosx(cosx-cosy)+sinx(sinx-siny)=2sin(x-y)/2
求函数z=sinx+siny+sin(x+y)(0
求sin(x+y)=sinx+siny的导数
证明sin(x+y)=sinx*cosy+cosx*siny的过程
求下列导数:sin(x+y)=sinx+siny e^x+x=e^y+y
求证:sin(2x+y)/sinx-2cos(x+y)=siny/sinx