arcsin(sinx+siny)+arc(sinx-siny)=kπ/2,K为奇数,求sin^2x+sin^2y的值
arcsin(sinx+siny)+arc(sinx-siny)=kπ/2,K为奇数,求sin^2x+sin^2y的值
sinx+siny=-1/3 cosx+cosy=1/2,求sin(x+y)的值.
求sin(x+y)=sinx+siny的导数
证明 [sin(2x+y)/sinx]-2cos(x+y)=siny/sinx
求证:sin(2x+y)/sinx-2cos(x+y)=siny/sinx
已知sinx-siny=1/2,cosx-cosy=1/2,x、y均为锐角,求sin(x-y)
证明sin(x+y)sin(x-y)=(sinx)^2-(siny)^2.
证明sinx+siny+sinz-sin(x+y+z)=4sin((x+y)/2)sin((x+y)/2)sin((x+
证明cosx(cosx-cosy)+sinx(sinx-siny)=2sin(x-y)/2
求函数z=sinx+siny+sin(x+y)(0
证明sin(x+y)sin(x-y)=sinx-siny
请问,如何证明sinx+siny=2*sin(x+y/2)*cos(x-y/2)