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The equation of the tangent to the parab...

The equation of the tangent to the parabola `y^(2)=16 x` at (1,4) is

A

` 9 x-2 y=56`

B

` 9 x-2 y+56=0`

C

`9 x=2 y+56`

D

none of these

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The correct Answer is:
D
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