(1/11)sec^2(x/11) 怎么求导

(1/11)sec^2(x/11) 怎么求导 sec x-tanx怎么能化简成2/(1+tan(x/2)), tan^2x=(sec^2-1) 怎么来的? 2ln|sec X+tan X|=ln|(1+sin x)/(sin x-1)|怎么证 (sec^2x-sinx+1/x-1/(1+x^2))dx怎么坐 ∫secx/sec^2x-1 dx 化简sec(x)^2-1如题, sec x -1 ~ 2x^2错了 是sec x-1 ~ 1/2(x^2) 正割Sec x怎么念? sec^2 x-1 =tan^2 x 怎么来的啊 tan^2x=sec^2x-1,不知道怎么相等, 导数化简y=tan x/(1+sec x)答案是sec x/(1+sec x)本人愚笨,怎么也不能化简成最后答案, y=sec^2*x/2 的导数怎么求 y'=sec²(x+y)* (1+y')怎么变到y'=sec²(x+y)/[1-sec²(x+y)] 高数(sec^2.x-1)求导2sec^2.xtanx 求导：f(x)=(sec x )/ (1+sec x) =∫dx/(2cos^2(x/2)+1)=∫sec^(x/2)dx/(2+sec^2(x/2))怎么出来的?=∫dx/(2cos^2(x/2)+1)=∫sec^(x/2)dx/(2+sec^2(x/2))求详细流程,我知识点. ∫1/x^2*sec^2(1/x)