lim(x→0)(1-cos2x)/(xsinx)的极限

问题描述:

lim(x→0)(1-cos2x)/(xsinx)的极限

lim(x→0)(1-cos2x)/(xsinx)
=lim(x→0)(2(sinx)^2)/(xsinx)
=lim(x→0)(2sinx)/(x)
=2