sec x-tanx怎么能化简成2/(1+tan(x/2)),
sec x-tanx怎么能化简成2/(1+tan(x/2)),
证明sec x+tanx=tan(π/4 +x/2)
tan^2x+1=sec^2x怎么记住
(2/tanx)*[1+(tanx)*tan(x/2)] 怎么化简
(1+sin x)/(1-sin x) = (2 sec^2 x )+(2 sec x tanx) - 1 怎么证明出来
tan^2 x - sec ^2 x 化简 tanx的平方减去secX的平方.
tan(x)sec^2(x)dx,secx的导是secxtanx就是sec(x)d(sec(x)) 但tanx的导是se
tan x /(1-cot x) + cot x /(1-tanx) = 1+ sec x csc x
求解一道高数极限题lim[tan(x+h)-2tanx+tan(x-h)]/h² h→0 答案为2sec
sec^2 x-1 =tan^2 x 怎么来的啊
请解释高数例题:1、∫tan ^2 x sec xdx 2、∫1/x^2+4 dx 3、∫tanx dsec^(n-2)
谁能帮忙整理下sin x、cos x、tanx、cot x、tan x/2、sin 2x、cos 2x、sec x、cs