数学求极限limX->0求【cosπ/2(1-x)】/x的极限

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数学求极限limX->0求【cosπ/2(1-x)】/x的极限
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数学求极限limX->0求【cosπ/2(1-x)】/x的极限
数学求极限limX->0求【cosπ/2(1-x)】/x的极限

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