sin(x+y)=1/2 ,sin(x-y)=1/3,求tanx/tany的值
sin(x+y)=1\2,sin(x—y)=1\3,求[tan(x+y)-tanx-tany]\[tany的平方tan(
已知x,y,z都是锐角,sin^2x+sin^2y+sin^2z=1,求tanx*tany*tanz的最值
若sin(x+y)=1/2,sin(x-y)=1/3,则tanx/tany等于?
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))
已知TanX,TanY是方程X^-3X-3=0的俩根,求sin^(x+y)-3sin(x+y)cos(x+y)-3cos
求证tanx+tany/tanx-tany=sin(x+y)/sin(x-y)(详细步骤)
已知sin(x+y)=1,求证:tan(2x+3y)=tany
已知tanx=1/4,tany=-3,求tan(x+y)的值
已知tanx=-3/4,且tan(x+y)=1,求tany的值
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
已知tanx,tany是方程x平方+Px+Q=0的两个根求sin(x+y)平方+
tanX,tanY是方程X²+(4M+1)X+2M=0的俩根,且M≠-1/2求sin(X+Y)/cos(X-Y