求lim(x-0)1-cos4x/2sin^2x+xtan^2x的极限

lim 1-cos4x/2sin^2x+xtan^2x x趋近于0 求极限 请教数学题求极限lim(x－∞) xtan x/x^2+1=? 求极限lim(x-->0)x^2 sin(1/x), lim x->0(sqrt(sin(1/x^2)) 求极限 这个题是等于无穷吗?lim(x-->0)(1-cosx^2)/(sin^2xtan^2x) 求极限 lim sin(x^2 * sin (1/x))/x x->0 求极限 （（sin(x^3+x^2-x)+sin x) /x x→0 已知lim sinx/x=1 求 lim(x→∞)[sin(2/x)+cos(1/x)]^x的极限. 求lim x→0时(2+e^ 1/x / 1+ e^ 4/x + sin x / |x| )的极限... 求lim [sin(x^2-1)]/(x-1) x趋向于1的极限. 求lim x趋向无穷 sin(x+1)/x^2的极限 求极限：lim x→0 ln[1+sin^2(x)]/[e^(x^2)－1]