lim(x→0)2-2cosx/x^3 求函数极值,

求lim(1-cosx)/x^2求lim(1-COSX)/X^2X→0 lim(x→0)(cosx-cos^2x)/x^2 lim(x→0)(cosx)^(1/ln(1+x^2)) lim(x→0)(cosx)^[4/(x^2)] lim x→0[ln(cosx)]/x^2 lim(x→0)(cosx)^4/x^2 怎么解 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 lim(x_sin)/(3x+2cosx) limx→0(cosx)^(1/x^2)求解lim(x→0)((cosx)^(1/x^2)) lim {[(1+2x)^1/2(1-cosx)]/x^3}=?x→0 lim(x→0)[(secx)^2-1] /(1-cosx) lim x→0(1+2cosx)^secx 求极限lim(x+3)(2+cosx)/(x^2+x) lim(x→0)2-2cosx/x^3 求函数极值, lim（x→0）（cosx）^csc^2（3x） lim x→0 (1-cosx)ln(1+x^2)/xsinx^3 求极限lim(x->0) 1/x^3 {[(2+cosx)/3]^x-1}求极限lim(x->0)1/x^3 {[(2+cosx)/3]^x-1} 已知lim(x→0) f(x)/(1-cosx) =2 求lim(x→0) [1+f(x)]^½