求lim(x→0) (1-cos x) /x^2的极限

求极限lim(x→0) cos(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) (cos x)^(1/x) 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) lim(x→0)(1/x)*cos(1/x) 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(1-√cosx)/(1-cos√x) (x→0+) 求极值lim(x→0)（sinx+x²cos(1/x)）/xlim(x→0)（sinx+x²cos(1/x)）/x/> 求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程, 求极限lim(x→0)(x^3sin1/x)/(1-cos^2x),要详细过程～ 求 lim(x→∞)[sin(2/x)+cos(1/x)]^x的极限. 如何求 lim(n→∞)cos(x/2)cos(x/4)...cos(x/2n) 利用lim sinx/x =1或等价无穷小量求极限 lim (cosαx-cosβx)/x^2 x趋向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