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已知曲线,则曲线在点P(2,4)处的切线方程为A.4x+y-12=0B.4x-y-4=0C...
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已知曲线
,则曲线在点P(2,4)处的切线方程为( )
A.4x+y-12=0
B.4x-y-4=0
C.2x+y-8=0
D.2x-y=0
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