lim（(sin2x/x^3)+a+(b/x^2))=2/3(x->0)设lim（(sin2x/x^3)+a+(b/x^2))=2/3(x->0),求a,b的值.

lim（(sin2x/x^3)+a+(b/x^2))=2/3(x->0)设lim（(sin2x/x^3)+a+(b/x^2))=2/3(x->0),求a,b的值. lim sin2x/3x x趋向0 lim(x->0) (sin2x)/(tan2x)2/3 lim(x->0)(tan3x+2x)/(sin2x+3x) lim＜x趋近0＞（e的ax次方-b）/sin2x=1/2,求a,b值 lim(sin2x)/3x＝ x趋向无穷大 lim x→正无穷 sin2x/3x =什么 lim(1-(cosx)^3)/(x*sin2x)怎么做? lim(x→π/4)(sin2x)^3极限是多少? 已知向量a=(sin2x,-cos2x),向量b=(sin2x,根号3sin2x),若函数f(x)=向量a 求lim(x→0) (x+sin2x)/(x-sin2x) lim x-0 sin2x/x 求极限 lim sin2x/x x趋近于0 lim[x→∞](sin2x)/x=? 求极限 lim(sin2x/sin3x) x->π lim（ x→0）sin2x / tan3x sin2x lim ------- x→0 tan3x 极限lim x 趋于0 sin2x/sin5x