若tan(π+x+y)=3/5,tan(y-π/3)=1/3则tan(x+π/3)=是π/3 不是整体除以3！

已知tan(x-y)=2,tan(y+π/5)=3,则tan(x+π/5)等于 若tan(2x+y)=3,tanx=5,则tan(x+y)等于多少 若tan(π+x+y)=3/5,tan(y-π/3)=1/3则tan(x+π/3)=是π/3 不是整体除以3！ 若tan(2x-y)=3tan(x-2y)=3,则tan(x+y)= 求证tan(x-y)+tan(y-z)+tan(z-x)=tan(x-y)tan(y-a)tan(z-x) 已知tan(x-pi/6)=3/7,tan(y+pi/6)=2/5,则 tan(x+y)=? tan(x+y)= 若tan(3x+y)=2,tan(x+y)=-4 求tan2x 已知tan（x+y）=3,tan（x-y）=5则tan2x等于 求 y=arc tan(tan^3x)的导数 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-z)tan(z-x)tan(x-y)+tan(y-z)怎么化成tan〔（x-y）+(y-z)〕? y=tan(π/2-x)定义域 求周期 y=tanπx 已知sin(2x+y)=5siny,(y不等于K派),求证;3tan=2tan(x+y) 函数y=tan(x+π/5)的单调区间 求y=5|tan(x/2-π/2)|周期 y=tan（x+3/π）的定义域是什么