已知0＜y＜x＜л,且tan x 乘以tan y=2,sin x乘以sin y=1/3,则x-y等于多少?

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（x+y）=1,求证：tan（2x+3y）=tany tan(x+y)tan(x-y)=sin^2x-sin^2y/cos^2x-sin^2y 顺便问一下. tan,sin, 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 已知sin(x+2y)=3sinx,求tan(x+y)*coty sin(x+y)=1,则tan(2x+y)+tany= sin（x+y)=1\2,sin(x—y）=1\3,求[tan（x+y）-tanx-tany]\[tany的平方tan（ 3sinX=sin(2X+Y) 求证：tan(X+Y)=2tanX sin(y+x)+根号3cos(x-y)为偶函数,tan(y)=__________ 用matlab绘制y=tan(sin(x^2))