lim(x^2+1)/(2x^+1) x趋向0

lim(x趋向0)ln(1+sin x)/x^2 求lim x趋向于0(arctanx)/(x^2+1) lim(1-2^x)^sinx x趋向于－0 lim（x趋向于0）（1-cosx)/x^2 lim(x趋向0)((sinx/x)+1)=2? lim 1-cos5x/x^2 x趋向0 求极限lim【1-cosmx)/x^2】,x趋向0 求极限 （1） x趋向x/6 lim ln(2cos2x) (2) x趋向0 lim(e^x-1)/x (3) x趋向0 x趋向0 lim cos(1/x),x趋向pai/2 tanx lim(x趋向无穷大)[1+2/(x+2)]^(x+2) lim(x趋向无穷)[1-(2/x)]^3x lim（x/（1+x^2））,x趋向无穷大