∫1/x^2*sec^2(1/x)
∫secx/sec^2x-1 dx
∫1/根号x*sec^2(1-根号x)dx
∫ sec^2 x dx
1、∫[2/(1+x^2) -sec^2)dx
∫1/(sec^2x+1)dx等于多少?
∫[(sec^2x-1)secx]dx=
tan^2x+1=sec^2x怎么记住
sec x-tanx怎么能化简成2/(1+tan(x/2)),
lim(x→0)(ln(1+x^2)/(sec-cosx))
(1+sin x)/(1-sin x) = (2 sec^2 x )+(2 sec x tanx) - 1 怎么证明出来
数学中Sec是啥意思极限x趋向于派/2,(1+Cos x)的2sec x次方
lim (x→0) [(2x) / (1+x^2)]/sec x tan x+si