lim(x->PI/2) COS X/(PI/2)-X

问题描述:

lim(x->PI/2) COS X/(PI/2)-X

lim(x->PI/2) COS X/(PI/2)-X =lim(x->PI/2) sin(PI/2-X/(PI/2)-X =lim(x->0) sinx/x=1哦电脑打的就是没有手写的好用,我想想就明白了