这个题是等于无穷吗?lim(x-->0)(1-cosx^2)/(sin^2xtan^2x)
问题描述:
这个题是等于无穷吗?lim(x-->0)(1-cosx^2)/(sin^2xtan^2x)
答
lim(1-cosx²)/(sin²xtan²x)
=lim2sin²(x²/2) / (x²*x²)
=2lim (x²/2)²/x^4
=1/2