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The line y = m x + 1is a tangent to the ...

The line `y = m x + 1`is a tangent to the curve `y^2=4x`if the value of m is(A) 1 (B) 2 (C) 3 (D) `1/2`

A

1

B

2

C

3

D

`(1)/(2)`

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