lim(x->0)[cosx-1+1/2 *(x^2)]/x^n=a 求 n ,a

求lim(1-cosx)/x^2求lim(1-COSX)/X^2X→0 lim(x—0) (1-cosx)/x lim(x→0)(cosx)^(1/ln(1+x^2)) lim(x趋向0+)x/[(1-cosx)^(1/2)] lim x->0 cos(2x)-1 / cosx -1 = lim（x趋向于0）（1-cosx)/x^2 lim(x->0)[cosx^(1/2)]^(π/x) (1) lim(x->正无穷) x-lnx (2) lim(x->0+) cosx^1/x^2 x趋于0 lim sinx-tanx/x^3=lim sinx/x×(cosx-1)/(x^2×cosx)是怎么通分的?x趋于0 lim sinx-tanx/x^3=lim sinx/x×(cosx-1)/(x^2×cosx)thank you 求Lim(x→0)(sinx/x)^(cosx/1-cosx) 求极限 lim x->0 1-cosx / 2x^2lim x->0 1-cosx / 2x^2 lim(1-cosx)x趋向0, lim(x→0)(1/cosx)=? lim(cosx)^(1/(1-cosx)).x趋向于0 大数lim(cosx)^(1/(1-cosx)).x趋向于0 lim(x→0)[(secx)^2-1] /(1-cosx) limx→0(cosx)^(1/x^2)求解lim(x→0)((cosx)^(1/x^2)) lim((sqr(2)-sqr(1+cosx))/((sinx)^2)) x->0