双曲线x2-y2/2 =1在点(-√2,√2)处的切线的方程是( ).(A)y=-x+√2.(B)y=-x+3√2.(C)y=-2x-√2.(D)y=-2x+3√2.
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如果曲线y=f(x)在点(x,y)处的切线斜率与x2成正比,并且此曲线过点(1,-3)和(2,11),则此曲线方程为( )。A. y=x3-2B. y=2x3-5C. y=x2-2D. y=2x2-5
设曲线y=y(x)上点P(0,4)处的切线垂直于直线x-2y+5=0,且该点满足微分方程y″+2y′+y=0,则此曲线方程为( )。A. B. C. D.
曲线y=x4-3在点(1,-2)处的切线方程为()A.2x-y-6=0 B.4x-y-6=0 C.4x-y-2=0 D.2x-y-4=0
曲线x2+y2=2x在点(1,1)处的切线方程为.
曲线y=lnx在点(1,0)处的切线方程为.
曲线y=e2x-4x在点(0,1)处的切线方程是()A.2x-y-1=0 B.2x+y-1=0 C.2x-y+1=0 D.2x+y+1=0