已知tanx=2,tany=3,x,y均为锐角,求证:x+y=135°
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
已知tanx=2,tany=3,x,y∈(0,π/2),求x+y.
求证tanx+tany/tanx-tany=sin(x+y)/sin(x-y)(详细步骤)
已知tanx=2,tany=1/3,则tan2(x+y)=
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))
已知sin(x+y)=1,求证:tan(2x+3y)=tany
已知x,y,z都是锐角,sin^2x+sin^2y+sin^2z=1,求tanx*tany*tanz的最值
已知tanx,tany是方程x^2+6x+7=0的两个根,求证sin(x+y)=cos(x+y).
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
已知sin(x+y)/cos(x-y)=m/n,则tanx/tany=?
已知sin(x+y)=1,求证:tan(2x+y)+tany=0