已知3sinx=sin(2y+x),求证tan(x+y)=2tany
已知sin(x+y)=1,求证:tan(2x+3y)=tany
已知sin(x+y)=1,求证:tan(2x+y)+tany=0
已知sin(x+y)=1,求证:tan(2x+y)+tany=0
sin(x+y)=1\2,sin(x—y)=1\3,求[tan(x+y)-tanx-tany]\[tany的平方tan(
已知2cos(2x+y)=cosy,求tan(x+y)tany的值
求证tanx+tany/tanx-tany=sin(x+y)/sin(x-y)(详细步骤)
3sinX=sin(2X+Y) 求证:tan(X+Y)=2tanX
sin(x+y)=1,则tan(2x+y)+tany=
已知sin(x+2y)=3sinx,求tan(x+y)*coty
若sin(x+y)=1/2,sin(x-y)=1/3,则tanx/tany等于?
已知:3sinY=sin(2X+Y),求证tan(X+Y)=2tanX
已知5siny=sin(2x+y),求证:tan(x+y)=3/2tanx