lim (sec x - tan x) limit是x->(pi /2 )-
lim (sec x - tan x) limit是x->(pi /2 )-
lim (x→0) [(2x) / (1+x^2)]/sec x tan x+si
lim x->pi (x^2-1)/cosx
tan(x)sec^2(x)dx,secx的导是secxtanx就是sec(x)d(sec(x)) 但tanx的导是se
lim(x→0)(ln(1+x^2)/(sec-cosx))
∫sec^4x dx ∫sec^2x tan^2x dx
tan^2x+1=sec^2x怎么记住
sec x-tanx怎么能化简成2/(1+tan(x/2)),
证明sec x+tanx=tan(π/4 +x/2)
求解一道高数极限题lim[tan(x+h)-2tanx+tan(x-h)]/h² h→0 答案为2sec
lim(x→pi)x^cosx
lim[sinx/(pi-x)] {x->pi} 求函数的极限