设tan[x+y]=5分之2,tan[y-4分之π,求]tan[x+4分之π的值]

设tan[x+y]=5分之2,tan[y-4分之π,求]tan[x+4分之π的值] 求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x) tan(x+y)= 设y=In tan 2x 求微分dy 设y=In(sec X+tan X ),求y' 已知tan(x-y)=2,tan(y+π/5)=3,则tan(x+π/5)等于 已知tan(x-pi/6)=3/7,tan(y+pi/6)=2/5,则 tan(x+y)=? y=tan 2x/tan x 的定义域是什么?y=tan 2x/tan x 的定义域是什么? 设函数y=tan x,求y`= 若tan(2x+y)=3,tanx=5,则tan(x+y)等于多少 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)〕? 设y=(tan^2 x-csc^2 x )/(tan^2 x+cot^2 x -1) (a)证明y=1- 2/(tan^4 x-tan^2 x +1) (b)求y值的范围 tanX=2分之1,tan（x+y）=5分之2,那么tanY=? 5cos(x-y/2)+7cos(y/2)=0求tan(x/2)*tan[(x-y)/2] 证明tan(x+y)+tan(x-y)=sin2x/cos^2x-sin^2y y=tan^2x+3tan-1,x属于[-三分之派,四分之派）的值域 若tan(2x-y)=3tan(x-2y)=3,则tan(x+y)=