tan(3x/2)-tan(x/2)-2sinx/(cosx+cos(2x))=?

2/tan(x)=3/tan(45-x)怎么解? tan(x/2)+tan(x/3)的周期如何计算? 求证tan(x+y)*tan(x-y)=tan^2x-tan^2y/1-tan^2xtan^2y tan（ x/2+π/4）+tan（x/2-π/4 ）=2tanxtan(x/2+π/4)+tan(x/2-π/4)=[tan(x/2)+tan(π/4)]/[1-tan(x/2)tan(π/4)]+[tan(x/2)-tan(π/4)]/[1+tan(x/2)tan(π/4)]=[tan(x/2)+1]/[1-tan(x/2)]+[tan(x/2)-1]/[1+tan(x/2)]=[(tan(x/2)+1)^2-(tan(x/2)-1)^2]/[1-(tan(x (tan x+1/tan)cos^2 x等于? ∫ ( tan^2 x + tan^4 x )dx 求不定积分∫(tan^2x+tan^4x)dx 不定积分(tan^2x+tan^4x)dx tan(2x)和tan(x)有关系吗?（0 sin2x/cos2x等于tan x 还是tan 2x 化简tan(3x/2)-tan(x/2)-sinx/(cos(3x/2)*cos(x/2)) 函数f(x)=tan(x+1)+tan(x+2)+tan(x+3)+.+tan(x+2013)图像的一个对称中心为? tan(x/2)=?化简 数学 [tan(x/2) +1 ]/[1 - tan(x/2)] + [tan(x/2) - 1]/[1 + tan(x/2)] 怎麼化简? (tan x/2-π/6) tan(x/2),求tanX tan~2x的不定积分 tan^2x+1等于?