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设点M(a,b)是曲线上的任意一点,直线l是曲线C在点M处的切线,那么直线l斜率...
设点M(a,b)是曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183708304774774/SYS201310241837083047747009_ST/0.png)
上的任意一点,直线l是曲线C在点M处的切线,那么直线l斜率的最小值为( )
A.-2
B.0
C.2
D.4
考点分析:
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