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The tangent to curve y=f(x) is perpendic...

The tangent to curve `y=f(x)` is perpendicular to X-axes if

A

`(dy)/(dx)=1`

B

`(dx)/(dy)= infty`

C

`(dx)/(dy)=0`

D

`(dy)/(dx)=infty`

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The correct Answer is:
D
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