lim(x→0)tan(2x^2)/1-cosx求解要过程
问题描述:
lim(x→0)tan(2x^2)/1-cosx求解要过程
答
lim(x→0)tan(2x^2)/1-cosx
=lim(x→0)tan(2x^2)/2sin²x/2
=4lim(x→0)[tan(2x^2)/2x²][(x/2)²/(2sin²x/2)]
=4