∫sec^2x/(2+sec^2x)d(x)不定积分

∫ sec^2 x dx ∫sec^2x/(2+sec^2x)d(x)不定积分 求(sec x)^2积分, sec^2(7x)积分 ∫（sec^2x+sinx)dx ∫secx/sec^2x-1 dx ∫(2-sec^2(x))^1/2 d(sec x) [上限为π/4下限为0] ∫sec^4x dx ∫sec^2x tan^2x dx lim(n>无穷)sec(x/2)sec(x/2^2)``````````sec(x/2^n) (x不等于0) 的极限 tan（x)sec^2(x)dx,secx的导是secxtanx就是sec(x)d(sec(x)) 但tanx的导是sec^2(x）就是tanxd(tanx)了? ∫(x^2+sec^2x)dx求积分 ∫1/x^2*sec^2(1/x) ∫sec^2 x / √ tan x +1 dx ∫1/根号x*sec^2(1-根号x)dx sec^2x dx不定积分是多少 lim sec^2~x→0 化简sec(x)^2-1如题, sec x -1 ~ 2x^2错了 是sec x-1 ~ 1/2(x^2)