lim(sinx/(pai-x)=?

问题描述:

lim(sinx/(pai-x)=?
x趋向于pai
pai即3.14.

变量替换,令t=pai-x,x->pai时,t->0
原极限变为lim[t->0] sin(pai-t)/t=lim[t->0] sint/t=1