∫1/x^2*sec^2(1/x)

∫secx/sec^2x-1 dx ∫1/x^2*sec^2(1/x) ∫1/根号x*sec^2(1-根号x)dx ∫sec^2 x / √ tan x +1 dx sec x -1 ~ 2x^2错了 是sec x-1 ~ 1/2(x^2) ∫ sec^2 x dx 化简sec(x)^2-1如题, ∫1/(sec^2x+1)dx等于多少? 求积分∫(sec^2x/根号(tanx-1))dx ∫[(sec^2x-1)secx]dx= ∫(2-sec^2(x))^1/2 d(sec x) [上限为π/4下限为0] sec x-tanx怎么能化简成2/(1+tan(x/2)), sec^2x-1等于tan^2x? 若x=1,sec^2x,等于多少 求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程, sec x / (1+x^2),求dy/dx忘打了--- y= （sec x) / (1+x^2) 1、∫[2/(1+x^2) -sec^2)dx2、∫[√(x)+1]^2/(x) dx 高数(sec^2.x-1)求导2sec^2.xtanx