已知 y*sinx-cos(x-y)=0,求dy的值?

已知 y*sinx-cos(x-y)=0,求dy的值? 已知函数Y=COS^2X-Sinx(o 求导y-sinx-cos(x-y)=0 y=2cos^2 x+sinx 已知sinx+siny+sinz=0,cosx+cosy+cosz=0,求证cos(x-y)=cos(y-z)=cos(z-x) 已知x,y是实数且满足sinx*cosy=1,则cos(x+y)= 已知sin(x-y)cosx-cos(x-y)sinx=3/5求tan2y的值 已知函数y=6-cos方x-4sinx,求y的最大值,最小值. 已知y=sinx+cos的五次方x,求y’ 化简cosxsin(y-x)+cos(y-x)sinx= 已知sinx=3/5,x∈(π/2,π),求【sin(x+y)+sin(x-y)】/【cos（x+y）+cos（x-y）】的值 已知Sin(x+y)Cosx-Cos(x-x)Sinx=3/5求tan2y的值 y=2^sinx + cos√x 求y’ y=sinx+cos^5 x,求y’ y=(2sinx-1)/(sinx+3)和y=cos^2x+sinx的值域 8y^3+sin2y+x^3+sinx=0求Cos(x+2y) 已知sinθ+cosθ=2sinx,sinθcosθ=sin²y,求证：4cos²2x=cos²2y 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).