1+sec(x)/1-sec2(x)=cos(x)/cos(x)-1
1+sec(x)/1-sec2(x)=cos(x)/cos(x)-1
求极限:lim(x→0)ln(1+x²)/ (sec x- cos x)
数学中Sec是啥意思极限x趋向于派/2,(1+Cos x)的2sec x次方
判断奇偶性 y=1+sec2次x-(tanx)是_函数.y=sinx-tanx/1+cos是_函数
f(x)=|sin x+cos x+tan x+cot x+sec x+csc x|最小值
=∫dx/(2cos^2(x/2)+1)=∫sec^(x/2)dx/(2+sec^2(x/2))怎么出来的?
∫(1+cos^3 x)sec^2 x dx 求不定积分~
/ (cos x + 1 ) dx
cos x>-1/2
∫ (1+cos^2 x)/cos^2 x dx =
2(cos x)^2=1+cos 2x,
sin(1/x)-cos(1/x)/x