数学求极限limX->0求【cosπ/2(1-x)】/x的极限

问题描述:

数学求极限limX->0求【cosπ/2(1-x)】/x的极限

limX->0【cosπ/2(1-x)】/x
=limX->0 cos(π/2-π/2x)/x
=limX->0 sin(π/2x)/x
=π/2