lim(x→0)(1-cos2x)/(xsinx)的极限
问题描述:
lim(x→0)(1-cos2x)/(xsinx)的极限
答
lim(x→0)(1-cos2x)/(xsinx)
=lim(x→0)(2(sinx)^2)/(xsinx)
=lim(x→0)(2sinx)/(x)
=2