求极限x→0 lim (1-cos ax)/sin^2x （a为常数）需要过程

求极限lim(x→0) cos(1/x) 求极限x→0 lim (1-cos ax)/sin^2x （a为常数）需要过程 求导数,求极限Lim x取近于0 ln(cos ax)/ln(cos x) 求函数极限：lim(x->0) (cos x)^(1/x) 求lim(x→0)x cos 1/x lim(x→∞)x^2/ (3x-1)的极限 求函数极限lim x→0 e^x-x-1/x cos x 求极限：lim（x→0）ln(1+x²）/ (sec x- cos x) 求极限lim(x->0)(1+ax)^(1/bx) 求极限lim(x→0)（1-根号cosx）/[x（1-cos根号x）] 求lim(x→0+） ( 2/π*cosπ/2(1-x))/x的极限 求lim(x→0) (1-cos x) /x^2的极限 求极限lim(x→∞) ((x²+1)/(x-1)-ax-b)=0 求极限lim(1-√cosx)/(1-cos√x) (x→0+) 求极限lim(x,y)→(0,0) [1-cos(x2+y2)]/[(x2+y2)e^x2y2] lim(x→0) (1-cos(1-cosx))/(arctanx^2)^2求极限 求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程, 高数极限高数极限高数极限请用洛必达法则求极限lim x→0 ln(1-ax)/ln(1+bx)=? 求极限lim(x→∞) ((x²+1）/（x-1）-ax-b)=0求a,b求极限lim(x→∞) ((x²+1）/（x-1）-ax-b)=0求a,b