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已知曲线y=x4+ax2+1在点(-1,a+2)处切线的斜率为8,a=( ) A...
已知曲线y=x4+ax2+1在点(-1,a+2)处切线的斜率为8,a=( )
A.9
B.6
C.-9
D.-6
考点分析:
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1(-1,0),F
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