曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直,求a,

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曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直,求a,曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直,求a,曲线Y=(X+1)/(X-1

曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直,求a,
曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直,求a,

曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直,求a,
f(x)=(x+1)/(x-1)=1+2/(x-1)
f’(x)=-2/(x-1)^2
f’(3)=-1/2
直线ax+y+1=0的斜率k=-a
f’(3)*k=-1
-1/2*(-a)=-1
a=-2 

将曲线化为y=x^2-1 再求导为y=2x 则在(3,2)的切线斜率为6 就是把3带入y=2x中
又因与ax+y+1=0垂直,则a=1/6

f’(3)=1/2
曲线Y=(X+1)/(X-1)在点(3,2)处的切线与直线ax+y+1=0垂直
则ax+y+1=0的斜率为 -2 即-a=-2 得a=2