已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101025718622618/SYS201311031010257186226021_ST/0.png)
(a∈R).
(1)当a=-3时,求函数f(x)的极值;
(2)设g(x)=f(x)+f′(x)+ax
2,若函数g(x)在区间(-1,1)有极值,求a的取值范围;
(3)若函数f(x)的图象与x轴有且只有一个交点,求a的取值范围.
考点分析:
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