lim(x趋于0)x2/sinX=lim(x趋于0)x2/x=lim(x趋于0)x=0(等价无穷小代换)
lim(x趋于0)cosX-1/(x2+x)=lim(x趋于0)-1/2*x^2/x(x+1)=lim(x趋于0)-1/2*x/(x+1)=0(等价无穷小代换)
lim(x趋于1)inx/X2-1=lim(x趋于1)(1/x)/(2x)=1/2(洛必达法则)
lim(x趋于0)x2/sinX=lim(x趋于0)x2/x=lim(x趋于0)x=0(等价无穷小代换)
lim(x趋于0)cosX-1/(x2+x)=lim(x趋于0)-1/2*x^2/x(x+1)=lim(x趋于0)-1/2*x/(x+1)=0(等价无穷小代换)
lim(x趋于1)inx/X2-1=lim(x趋于1)(1/x)/(2x)=1/2(洛必达法则)