已知sin(2x+y)=5siny,(y不等于K派),求证;3tan=2tan(x+y)
已知5siny=sin(2x+y),求证:tan(x+y)=3/2tanx
已知:3sinY=sin(2X+Y),求证tan(X+Y)=2tanX
tan(x+y)=2tanx(x,x+y≠kπ+π/2,k∈Z),证3siny=sin(2x+y)
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
已知sin(2x-y)5/13,siny=-3/5,x属于(派/2,派),y属于(-派/2,0),求sinx的值
3sinX=sin(2X+Y) 求证:tan(X+Y)=2tanX
已知x-y=派/3,且sin x-siny=1/2,求cos(x+y).
已知sin(x+2y)=3sinx,求tan(x+y)*coty
tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin,
求函数y=tan(2x-π/3),x不等于(5π/12 + kπ/2)