求sin(x+y)=sinx+siny的导数还有一题 e^x+x=e^y+y

求函数z=sinx+siny+sin(x+y)(0 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. 证明sin(x+y)sin(x-y)=sinx-siny 求sin(x+y)=sinx+siny的导数还有一题 e^x+x=e^y+y 求下列导数：sin(x+y)=sinx+siny e^x+x=e^y+y 证明sinx+cos(x+y)siny/cosx-sin(x+y)siny=tan(x+y) 求推导sinx-siny=2cos（(x+y)/2)sin((x-y)/2) 为什么sinx*cosy-cosx*siny=sin(x-y) 存在sin( x -y) = sinX-sinY吗 sin(x+y)-sinx=2siny/2·cos(x+y/2)怎么来的 已知x,y,z属于(0,派/2),sin^2x+sin^2y+sin^2z=1,求(sinx+siny+sinz)/(cosx+cosy+cosz)的最大值 已知(sinx)2-(siny)2=m求sin(x y)sin(x-y)求sin(x+y)sin(x-y) 1.已知8cos(2x+y)+5cosy=0,求tan(x+y)*tanx的值.2.已知关于x的方程x^2+px+q=0的两根是tanx,tany,求sin(x+y)/cos(x-y)的值.3.化简:sin(x-y)/(sinx*siny)+sin(y-z)/(siny*sinz)+sin(z-x)/(sinz*sinx). 已知sinx+siny=1/3,cosx-cosy=1/5,求cos(x+y),sin(x-y).求过程! 证明 [sin(2x+y)/sinx]-2cos(x+y)=siny/sinx 求证sin（2x+y)/sinx-2cos(x+y)=siny/sinx 求证：sin(2x+y)/sinx-2cos(x+y)=siny/sinx