洛必塔法则。原式=lim(x→1) sin(2x-2)/1=0
o/o型,洛必达法则原式=lim(x→1) [2sin(x-1)cos(x-1)]/1 =lim(x→1) sin(2x-2) =sin0 =0望采纳
lim(x->1) [sin(x-1)]^2/(x-1) (0/0)=lim(x->1) 2sin(x-1).cos(x-1)=0