若tan(2x-y)=3tan(x-2y)=3,则tan(x+y)=

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 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 tan(x+y)= 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x) 证明tan(x+y)+tan(x-y)=sin2x/cos^2x-sin^2y y=tan(π/2-x)定义域 求导 y=ln(tan(x/2)) y=tan(2x-派/4) y=2tan(x/2)-3tan(y/3),求其周期 1 求证：tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-z)tan(z-x)2 已知a+b+c=npai(n属于Z),求证：tan(a)+tan(b)+tan(c)=tan(a)tan(b)tan(c)（提示：在等式a+b=npai-b同时取正切） {sec^2(x/y)}/{tan(x/y)}=? 已知sin(2x+y)=5siny,(y不等于K派),求证;3tan=2tan(x+y)