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The number of points on the curve y=54x^...

The number of points on the curve `y=54x^(5)-135x^(4)-70x^(3)+180x^(2)+210x` at which the normal lines are parallel to `x+90y+2=0` is :

A

`2`

B

`4`

C

`0`

D

`3`

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The correct Answer is:
B
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