若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
若x、y是锐角且tanx=2/3tany=3/4则sin(x+y)等于
若sin(x+y)=1/2,sin(x-y)=1/3,则tanx/tany等于?
sin(x+y)=1\2,sin(x—y)=1\3,求[tan(x+y)-tanx-tany]\[tany的平方tan(
证明 (tanX+tanY)/(tanX-tanY)=(sin(X+Y))/(sin(X-Y))
求证tanx+tany/tanx-tany=sin(x+y)/sin(x-y)(详细步骤)
实数x,y满足tanx=x,tany=y,且|x|≠|y|,则sin(x+y)x+y−sin(x−y)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
已知tanx=-3/4,且tan(x+y)=1,求tany的值
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sin(x+y)/cos(x-y)=m/n,则tanx/tany=?
已知sinx+siny=2sin(x+y)≠0,则tanx/2tany/2等于 是三角函数和差化积部分的
cos(x+y)=1/5,cos(x-y)=3/5则tanx.tany=?