若tan(3x+y)=2,tan(x+y)=-4 求tan2x

若tan(2x-y)=3tan(x-2y)=3,则tan(x+y)= 求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y 若tan(2x+y)=3,tanx=5,则tan(x+y)等于多少 若tan(3x+y)=2,tan(x+y)=-4 求tan2x tan(x+y)= 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x) y=tan 2x/tan x 的定义域是什么?y=tan 2x/tan x 的定义域是什么? tan(x-y)=2,tan(x+y)=3 求tan2x/tan2y 已知tan(x-pi/6)=3/7,tan(y+pi/6)=2/5,则 tan(x+y)=? 已知tan(x-y)=2,tan(y+π/5)=3,则tan(x+π/5)等于 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-z)tan(z-x)tan(x-y)+tan(y-z)怎么化成tan〔（x-y）+(y-z)〕? 求 y=arc tan(tan^3x)的导数 证明tan(x+y)+tan(x-y)=sin2x/cos^2x-sin^2y y=tan|x|值域 y=tan(x平方) y=2tan(x/2)-3tan(y/3),求其周期 y=tan(π/2-x)定义域 求导 y=ln(tan(x/2))